未选择选择元素中的第二个选项时禁用按钮

// linking values to dropdowns
var placesLists = {
  'uiteten': '#uiteten',
  'snackensnoepen': '#snackensnoepen',
  'drankje': '#drankje',
  'evenement': '#evenement',
  'stappen': '#stappen',
  'cultuur': '#cultuur',
  'sightseeing': '#sightseeing',
  'kids': '#kids',
  'informatie': '#informatie',
};

$('select[name=watwiljedoen]').change(function() {
  //hide all extra lists
  $('.hide').hide().prop("disabled", true);
  $('#disabledselect').hide();

  //get current value
  var value = $(this).val();
  
  // hide the button by default on change
  var $button = $("[type=submit]");
  $button.prop("disabled", true);
  // only enable it if the selected option is shoppen
  if (value === "shoppen") {
    $button.prop("disabled", false);
  }
  
  //if there is a list for this value, show it
  if (value in placesLists) {
    $(placesLists[value]).show().prop("disabled", false);
    $(placesLists[value]).removeClass('dropdownwwjdnonactive');
    $(placesLists[value]).addClass('dropdownwwjd');
    $(placesLists[value]).find("option:first-child()").prop("selected", true); // move to the first disabled option to force selection
  }
});

// when a select different than the first one is changed
$('select:not([name=watwiljedoen])').change(function() {
  //get current value
  var value = $(this).val();
  
  // disable the button by default
  var $button = $("[type=submit]");
  $button.prop("disabled", true);
  
  // enable the button if the value is not null
  if (value != null) {
    $button.prop("disabled", false);
  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form class="" action="wat-wil-je-doen" role="form" method="post">
      <select class="dropdownwwjd" name="watwiljedoen">
        <option value="lorem" disabled selected>Wat wil je gaan doen?</option>
        <option value="shoppen">Shoppen</option>
        <option value="uiteten">Uit eten</option>
        <option value="snackensnoepen">Snacken / snoepen</option>
        <option value="drankje">Drankje doen</option>
        <option value="evenement">Evenementen bezoeken</option>
        <option value="stappen">Stappen</option>
        <option value="cultuur">Cultuur snuiven</option>
        <option value="sightseeing">Sightseeing</option>
        <option value="kids">Kids</option>
        <option value="informatie">Meer informatie</option>
      </select>
      <select id="disabledselect" class="dropdownwwjdnonactive" disabled>
        <option value="sdgsdg">Verfijn je keuze</option>
      </select>
      <select id="uiteten" class="dropdownwwjdnonactive hide" name="tag">
        <option disabled selected>Verfijn je keuze</option>
        <option value="ontbijt">Ontbijt</option>
        <option value="lunch">Lunch</option>
        <option value="diner">Diner</option>
        <option value="vis">Vis</option>
        <option value="vlees">Vlees</option>
        <option value="broodje">Broodje</option>
        <option value="patatje">Patatje</option>
        <option value="tapas">Tapas</option>
        <option value="hamburger">Hamburger</option>
        <option value="grieks">Grieks</option>
        <option value="pizza">Pizza</option>
        <option value="pasta">Pasta</option>
        <option value="traiteur">Traiteur</option>
      </select>
      <select id="snackensnoepen" class="dropdownwwjdnonactive hide" name="tag">
        <option disabled selected>Verfijn je keuze</option>
        <option value="snelle snack">Snelle snack</option>
        <option value="snoepen">Snoepen</option>
        <option value="IJsje">IJsje</option>
        <option value="kroketje">Kroketje</option>
        <option value="brammetje">Brammetje</option>
      </select>
      <select id="drankje" class="dropdownwwjdnonactive hide" name="tag">
        <option disabled selected>Verfijn je keuze</option>
        <option value="iets fris">Iets fris</option>
        <option value="thee">Thee</option>
        <option value="koffie">Koffie</option>
        <option value="biertje">Biertje</option>
        <option value="wijntje">Wijntje</option>
        <option value="whiskey">Whiskey</option>
        <option value="cocktail">Cocktail</option>
        <option value="slush">Slush</option>
      </select>
      <select id="evenement" class="dropdownwwjdnonactive hide" name="tag">
        <option disabled selected>Verfijn je keuze</option>
        <option value="in het stadscentrum">In het stadscentrum</option>
        <option value="evenement">Evenement</option>
        <option value="braderie">Braderie</option>
        <option value="rondje dorp">Rondje dorp</option>
      </select>
      <select id="stappen" class="dropdownwwjdnonactive hide" name="tag">
        <option disabled selected>Verfijn je keuze</option>
        <option value="eten">Eten</option>
        <option value="drinken">Drinken</option>
        <option value="theater">Theater</option>
        <option value="danser">Dansen</option>
        <option value="muziek">Muziek</option>
      </select>
      <select id="cultuur" class="dropdownwwjdnonactive hide" name="tag">
        <option disabled selected>Verfijn je keuze</option>
        <option value="kunst">Kunst</option>
        <option value="stadscentrum historie">Stadscentrum historie</option>
        <option value="buitenlandse restaurants">Buitenlandse restaurants</option>
        <option value="cultuur">Cultuur</option>
        <option value="schilderen">Schilderen</option>
        <option value="kunst uitleen">Kunst uitleen</option>
        <option value="uitleen">Uitleen</option>
        <option value="galerie">Galerie</option>
        <option value="workshops">Workshops</option>
      </select>
      <select id="sightseeing" class="dropdownwwjdnonactive hide" name="tag">
        <option disabled selected>Verfijn je keuze</option>
        <option value="architectuur bekijken">Architectuur bekijken</option>
        <option value="de boekenberg">De Boekenberg</option>
        <option value="theater de stoep">Theater de Stoep</option>
        <option value="voorstraat">Voorstraat</option>
        <option value="museum winkel">Museum winkel</option>
      </select>
      <select id="kids" class="dropdownwwjdnonactive hide" name="tag">
        <option disabled selected>Verfijn je keuze</option>
        <option value="speelgoed">Speelgoed</option>
        <option value="speeltuin">Speeltuin</option>
      </select>
      <select id="informatie" class="dropdownwwjdnonactive hide" name="tag">
        <option disabled selected>Verfijn je keuze</option>
        <option value="parkeren">Parkeren</option>
        <option value="naar de wc">Naar de wc</option>
        <option value="plattegrond bekijken">Plattegrond bekijken</option>
        <option value="koopzondagen">Koopzondagen</option>
        <option value="toezicht en beveiliging">Toezicht en beveiliging</option>
      </select>
      <br>
      <input type="submit" class="wwjdbutton" name="button" value="Bekijk resultaten" disabled>
      <!-- <button type="button"  name="button">Bekijk resultaten</button> -->
    </form>