From Fort Wilderness, the most convenient are Chef Mickey's at the Contemporary and Whispering Canyon at Wilderness Lodge.
However, we really enjoy all of the breakfast buffets at all of the MK resorts, with 1900 Park Faire at the Grand Floridian being our favorite.
I'm not sure, but I believe the only lunch choices at the MK resorts are Grand Floridian Cafe and Whispering Canyon Cafe.
(Don't know if the Wave serves lunch.)
I know Ohana only does breakfast and dinner, Chef Mickey's only does breakfast and dinner, and 1900 Park Faire only does breakfast and dinner.