We did Cinderella's Gala Feast at the Grand Floridian Cafe for DD6's birthday dinner and it was wonderful. Better than if it had been in its usual buffet location, I think, and the cake from the GF bakery was just as good as everyone says it is! I ordered one with fresh strawberries & custard between layers, and it was perfect - not too sweet and very fresh and light.
For DS9's birthday in January, I have a reservation at Artist Point, because he's dying to try the wild game on their menu. I'm not thrilled with the cake options there, but DS doesn't have DD's sweet tooth so an awesome custom cake it isn't as important for his b-day.