Have to concur, in IOA Mythos is the best for a full service sit down eatery. Confisco's is ok. If you do not mind picking up your food at a counter and finding your own seat then each area has this type of place. The Enchanted Oak is a must see on the inside up on the ceiling. I think that Thunder Falls Terrace has the best ribs and chicken combo.
At USF there is Finnegans and Lombardis for full service, but Monsters Cafe has a wide assortment of food choices and the old horror film clips playing is great. Sorry no buffets in the parks, i believe there is one in city walk.