If you really liked the ribs at the Big Thunder Ranch BBQ, then I would consider giving the River Belle Terrace a try. They have ribs (not all you care to eat, but the plate comes with 6 ribs and two sides) and I think taste pretty similar to the ones that used to be served at the BBQ.
I also really like Cafe Orleans, and especially recommend the Pommes Frites and Gumbo! The only drawback to Cafe Orleans is that most of the seating is outdoors, so it can be weather dependent (i.e., if it's raining they might close). I also very much like Carnation Cafe. It features a more "comfort food" type of menu. The Loaded Baked Potato Soup, Fried Dill Pickles, and Meatloaf are my favorite items. In DTD, I second the recommendation for Jazz Kitchen. The Bourbon Street sampler is very good, as are the shrimp & grits! In the hotels, I really like Storytellers (dinner buffet). It has a nice wide assortment of items.