We eat at least one meal at Trail's End Buffet on each trip. We stay at Fort Wilderness, so it's convenient, not expensive relative to other WDW choices and my kids love the food.
At MK we always eat at Pecos Bill, another family favorite.
I've been four times in the past few years and we haven't hit the same restaurant every trip. The closest we came was LeCellier, we ate there in April, had reservations for October (couldn't go because the gas in the kitchen was off and they couldn't cook the night we were there (!) ) and we have reservations to go again in March.