Epcot's my favorite park!
First of all, you have two amazing subsections. FutureWorld, and World Showcase.
Future World has Innoventions, Mission Space, Figment and Test Track (even if Test Track was better before the re-themeing...)
Oh, can't forget about Club Cool, many days after I'd get off work at Magic Kingdon, I'd head to Epcot for free drinks there. haha.
World Showcase is just gorgeous. 11 different countries to walk though, each with Cast members from those countries. I befriended a nice girl from China while I lived there.
Illuminations is an underrated night time show as well. I love the pre-show before Illuminations, when the Torches light and you hear the great music start