Wow; I don't know why, but I'll have to go with what everyone else said!
I like that it's less crowded and more grown up, the festivals, the Christmas festivities, Illuminations, World Showcase, food, Ellen, childhood memories, Maelstrom, virutal postcards, the House of the Future, dancing fountains, Club Cool, wide open spaces, everything!! Holidays Around the World is great!
I really like the whole Epcot area: the resorts and Boardwalk, the boats. I also enjoy the American Adventure, Voices of Liberty, Candlelight Processional, concerts, Circle-Vision movies. The whole park has this genuine feeling that the others don't quite attain, although the resort wouldn't be the same to me if any of the parts were missing. I always remember exiting World Showcase at night. Everything was so lit up and beautiful. I also like all the sponsors and the focus on the future and hope for mankind. It just resonates more with me than fantasy and dreams (although I can be a sucker for those too).
Epcot has always been my favorite park, but I always feel at home there since it was the first park where I worked. I enjoyed the people I worked with, and compared to other locations, it's a relatively relaxed atmosphere. World Showcase costumes are fantastic, Future World costumes haven't been updated in the past two decades. Everyone I met seemed genuine and all the IPs are genuinely friendly. Plus Brad Rex seems like a cool guy. And on my days off I would sometimes wander around the park and try something different, like seeing Impressions de France, or going further back in Morocco or Japan. And Mariachi Cobre blew me away and got me interested in mariachi. I love Reflections of China and Mo'Rockin and Off Kilter and The British Invasion and World Showcase Players and looking for characters in their native countries, watching the Fountain of Nations, the Jammitors, The Land!, Soarin', and The Seas!
I think I could go on and on. I just feel like it was just my kind of park. My family also spent a lot of time at Epcot in the past. It sometimes feels like the abandoned park from the 80s that few claim as their favorite, which makes it feel even more special to me. Oh, Epcot...those were happy times...at least in retrospect. It doesn't matter how Epcot changes; it will always have a special place in my heart!