Buffets are good, as well as the all you can eat skillets at Whispering Canyon. My ds likes those chicken and ribs combos at counter service places.
If you're not on the dining plan, it's less expensive to forgo dessert in the restaurant and to grab a snack a little later in the park. You can also carry in your own snacks, maybe some energy bars, an apple, a small bag of pretzels, etc. I always keep snacks in our room.