EPCOT is my second favorite park. DAK is my first.
But before there was DAK, EPCOT was #1 from the moment I set foot on Disney property.
I am not fond of amusement parks, so on my first trip to Walt Disney World, I was afraid that it would be all coasters and tilt a whirls and nothing would be interesting. My first Disney ride was Spaceship Earth. The animatronics, the smell of rome, the entire sensory experience that they called a "ride" defined disney for me and I fell in love immediately.
When I did my college program, if I had a bad day I would go ride on spaceship earth to remind myself why I was there. To see other people experience their first disney ride for the first time is really magical.
Aside from spaceship earth, the wide open spaces are a real draw for me (all the other parks can get cramped, but EPCOT always seems to have plenty of roaming space and nice green grass to look at). The architecture is unique and not amusement park cutesy.
I'm also a museum lover so I love learning a little something while on vacation. You can always learn something at EPCOT.