I am a big fan of the fish and chips at the Yorkshire County Fish Shop in Epcot's UK pavilion.
I also love some of the baked goods at the Starring Rolls Bakery in DHS, and the Veiled Maiden (a delicious parfait-like concoction of chilled apple sauce and whipped cream) at Kringla Bakeri og Cafe in Epcot's Norway.
For something a little different that even picky eaters will enjoy, try the chicken ad/or lamb schwarma at the Tangerine Cafe in Epcot's Morocco pavilion. NOTE: Moroccan food IS NOT SPICY!
Many people are enamored of the food court in Epcot's Land pavilion. It has a lot of more upscale-deli offerings that are a welcome change from the standard burgers and fries.
Flame Tree BBQ in DAK has terrific BBQ chicken and other offerings.