Our family's faves (Me, DH, DS4, DS2 last visit) in '03:
MK-Pecos Bill's had a great fixings bar with saute'd onions and mushrooms
EPCOT-Cantina de San Angel had decent combo plates, large margaritas, and seating for Illuminations
MGM-Rosie's All-American had decent burgers and was a close walk into Fantasmic, but only has out-door seating.
AK-Another vote for Tusker House. Their food is fresh and served in large quantities for sharing, and we always seem to meet the friendliest & most interesting CM's there
Having eaten with young kids in each, I can say their menus are kid-friendly too.
I also have veggie-friendly choices (from going with Dad, a strict vegan) if you are interested.
Have a great trip!