First, this thread should really get posted in the restaurants board.
Second, there are so many great options! Here's my list of favorites for food quality and variety:
Magic Kingdom:
-Liberty Square Market
-Columbia Harbor House
Hollywood Studios:
-Starring Rolls Café
Animal Kingdom:
-Flame Tree BBQ
-Harambe Market (haven't tried it myself yet, it's brand new and the reviews are all good)
Epcot: almost impossible to go wrong anywhere here
-Sunshine Seasons in Future World
and depending what type of cuisine you like in world showcase -
-Boulangerie Patisserie les Halles in France Pavilion
-La Cantina de San Angel in Mexico
-Katsura Grill in Japan