You didn't mention if you were looking for Table Service or Counter Service, so I'll just give my picks for both.
CS - Cosmic Rays. There are so many choices there - if I don't know what I want, I always head there!
TS - Liberty Tree Tavern. The atmosphere alone makes it for me. I'm a little bummed that they stopped doing Character Dining, but it is still my pick. In addition to the atmosphere, I love the food. The dressing for the salad is awesome - I believe it's a strawberry vinagrette. The meat is so tender and the sauces that go on top are awesome. The side are very good as well. For dessert, it is usually apple cobbler with vanilla ice cream - a great end to a great meal!