Rainforest Cafe has some large portions if you want to share.
Sci-Fi at MGM is Middle of the Road
At Epcot they have Counter Service that is much different from just Burgers and Fries.
At Animal Kingdom Tusker House BBQ is good.
At Magic Kingdom you have The Plaza, Caseys, Pecos Bills, and a few more.
At Downtown Disney you have Rainforest, Earl of Sandwich, Wolfgang Puck Express, House of Blues and even McDonalds...LOL!
There is also a shopping center right outside Disney with middle of the road restaurants.