Boma at AKL is great--buffet with some very different choices, but still enough for picky eaters. Stroll around outside and see the animals before.
Trails End at the campground is another buffet. Very, very good comfort food--home cooking like fried chicken, ribs, cornbread, etc. You can take the boat from MK and it makes for a nice evening.
You already have Park Fare which is great!
Whispering Canyon at Wilderness Lodge is a lot of fun for the kids! Some antics by the staff that makes for a fun atmosphere. Food is also quite good.
Personally, I won't go back to Chef Mickey's. Yuck! But if you haven't done it before, it's probably one of those things everyone should try!
You could also consider something at Downtown Disney. We're trying Raglan Road this year because we've heard so many good things about it.
We really did enjoy T-Rex too. Thought it would just be typical chain restaurant food, but it was quite good. And service was the best we had that trip.