We really love Liberty Tree Tavern dinner. The ambiance is great, and the food is so simple and tasty. The characters are friendly, but not too overbearing. It's become a must at the beginning of each trip.
We also discovered another favorite, the Crystal Palace breakfast, on our last trip. It was our last day, and we didn't have any real plans for the day. We decided that we wanted to do breakfast at the Magic Kingdom, and there just happened to be availability there. I think it's the best breakfast buffet that I've ever had!
We've also had many other good meals at WDW, but these are the only two that we plan on consistently going to because we enjoyed them that much.