For me, I remember the first time I saw WDW very vividly. We were on holiday in a caravan in Wales when I was young and I can remember lying on the couch, watching the tv upside down and watching the presenters on the breakfast show outside the castle with a bunch of kids. It was in the 70s so probably not long after Disneyworld opened.
Since holidays were always wales, I didn't get there until much later. I was coming back from a disastrous business trip and had had WAY too much wine on the plane on the way back. The company, hateful though it was, arranged a car and driver at the airport to take me home and on the way home the driver, realising I was incredibly depressed and somewhat drunk, asked how things were. I explained I was in a really stressful business and had had an awful year. He went on to tell me that he'd had the same until he retired and started his executive car company but that every year he now went with his family to this wonderful place called EPCOT to relax. There was this huge lake around which everyone gathered to watch the fireworks. By the time I got home I knew I had to go and see them.
The rest is history. My first trip to EPCOT blew my mind. I was completely wowed by the fireworks and the size of EPCOT itself! couldnt imagine how much there was to explore. Cast Members said hello and smiled every time I passed them and whilst I was waiting in queues, on more than one occasion, a CM would come over and offer me a drink!
To me, it's EPCOT not Magic Kingdom that let's me know I'm at Disney World and although I love wishes, illuminations is the one that gets me teary.