Been to Biergarten for lunch and Flying Fish for dinner.
Biergarten is a pretty good German buffet. As such you'll find lots of potatos, salad, chicken, wurst, speatzle, gravy. Seating is communal - tables seat, as I recall, eight people usually, so expect to sit with other folks. (We've always met really interesting people here - small world type experiences where the guy we were sitting next to had worked for the same company my Dad worked for years before and knew the same people).
Flying Fish is (IMO) excellent, but its expensive. Its pretty upscale, but - like most Disney upscale restaurants - "casually so" - so you can bring well behaved children here.