New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: "Debounce",
  it: false,
  actions: {
		changeIt() {
			this.toggleProperty('it');
		}
  },
  logIt() {
    console.log('logging it');
    console.log(this.get('it'));
	},
  observeIt: Ember.observer('it', function() {
   console.log('will debounce');
   Ember.run.debounce(this, 'logIt', 5000);
  }),

});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<button {{action 'changeIt'}}>Press Me</button>

twiddle.json

{
  "version": "0.8.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}