We have only been once (last summer) but we did the deluxe dining plan and there are a few that are at the top of our list to do again on our next trip:
Yak and Yeti, Brown Derby (for the cob salad), California Grill for the food and fireworks, and 1900 Park Fare breakfast for the Characters. Tusker House Breakfast for the food they had a lot of variety compared to the other breakfast buffets we did. Other than those we are probably going to try all new restaurants.
On the list of probably not going to try again:
Breakfast buffets: Chef Mickeys, Crystal Palace, Ohana
Other restaurants: Coral Reef (We all felt the food was a little boring and the seating did not take advantage of the aquarium idea), Restaurant Marrakesh Just did not care for Moroccan food.