Crystal Palace is a character meal buffet -a lot of people love it, but if you're not interested in characters, this may not be for you
Liberty Tree Tavern for dinner is all-you-can eat turkey dinner served family style (no longer any characters).
The Plaza is good, but basically just serves sandwiches, so you'll want to consider something else, if you're looking for more than that.
Have not eaten at Tony's Town Square, but I've heard good things.
As a previous poster said, there are a bunch of good choices at the resorts on the monorail loop as well, if nothing in the park suits your fancy.