There are a good number of QS locations where I've been, not only impressed with, but amused by the amount of food they dole out per dish:
Magic Kingdom: Columbia Harbour House
Epcot: Sunshine Seasons (with a good variety to boot!)
Hollywood Studios: Eh... Now that Starring Rolls is closed, I can't think of anywhere at this park that fits your criteria
Animal Kingdom: Flame Tree BBQ (the chicken and ribs combo is a heckuvalotuv food)