We ate at Fulton's crab house last year, the meal and service were both great. Quite pricey but we felt worth the money.
If it's just adults in your party then I'd recommend Victoria and Alberts at Disneys Grand Floridian Hotel, it's very special but not for children. There is the mouseketeers club at the hotel that you can book the kiddies into while you eat, but we haven't tried it. (Have actually booked the kids in while we're there in April, so will report back!)