Ohana is yummy, but they do have games and interactive things happening while you eat. Not sure if you are "down with that" since you say no characters.
Also - people on here like Boma and Jiko in Animal Kingdom Lodge. We thought Boma was OK, but do not plan to return. (I think we just really truly do not like buffets).
Also at Downtown Disney, we enjoy Bongos for Cuban food.
We are trying Spoodles at Boardwalk this time and the reviews for that seem good.