Epcot is also our favorite park(well..maybe not for DD 2)! My DD's are 12, 16 and 2 and we have been going for 5 years as a family. DD's love this park, and even though DD 16 is a thrill ride junkie, she has no problem spending AT LEAST one full day in Epcot(this is our main park and we usually spend a couple full days there).
I know I'm repeating others, but maybe you need to hear over and over what the rest of us love to convince you to seek out more things. Besides the thrill rides(as thrilling as they can get in Epcot) in FW, try relaxing a bit and going thru Innoventions, checking out the aquarium in Living Seas, go to the ImageStation and send goofy emails to friends and family. Visit Club Cool(is this what it's now called??)...the old Ice Station Cool...and try all the different drinks...people watch and laugh as guests try the Beverly for the first time. People watch EVERYWHERE. Head over to WS(our favorite part of the park) and S L O W L Y stroll through each country, enjoyinh every nook and cranny. If you have younger kids, do the Kidcot stations. Buy a passport book at the first gift shop and have it stamped in each country you visit. Try the counter service restuarants in the countries that have them(most do)...check out the CS menus on Allearsnet.com ahead of time, then buy things in each country and share them. Go thru the shops. Just by doing this you'll learn so much about each country. What kinds of candies they eat, what things are made in each country. Buy a small pkg of candy from each country and share them later or give as gifts to friends back home. Check out the Mexican marketplace, the Norwegian Stade Church and the Viking ship, i have a hard time telling you what to do in China because for some reason we pass it by most of the time(note to self: EXPLORE CHINA), Check out the shops in Germany..I love these shops and I always get a glass of wine and some candy there(and we LOVE to eat at the Biergarten). There's the candy lady in Japan, and Kaki Gori too(like a snow cone, only better), the living statues in Italy, the belly dancers in Morocco(this is a great pavilion to stroll thru also), the balancing chair guy thingy show in France(and the pastries there...also in Italy).....Try a snack thing of the Fish and Chips in the UK from Yorkshire Co. Fish Shop(and get a Guinness to go with it)...the garden and maze in the UK along with The British Invasion(awesome!!..I just saw them and almost threw my undergarments up there!!

)....Must see OffKilter on the stage between the UK and Canada...we loved them so much last year that we bought a CD! I'm sure I forgot many things, but these are just the tip of the iceberg. We have learned thru the years to slow down at WDW and enjoy everything. All the little details that make these parks the greatest. We've done all the major stuff and worn ourselves out doing it all. No more. We take our time, smell the roses(and the jasmine...yum)...Its so much better that way!
Have a good time....enjoy EPCOT!