I loved Boma.
I went there last year on the dining plan. We also went to Tony's Town Square, California Grill, Flying Fish, and Rose and Crown, and I would have to say that while Flying Fish was my favorite, Boma and California Grill were competing for second place.
The prime rib at Boma was outstanding, and they had some chicken too for the meat eaters. They have a million soups, standard kid fare, tons of salads, side dishes like Potatoes with Afritude (which are just kinda like spicy american fries). The desserts were outstanding. Everything was fresh and hot. There were comfort dishes along with adventurous dishes, and however unlikely it is for a buffet, there was no way to get bored with the food... you just can't try everything and not burst.... believe me, I tried.
I don't want to talk it up toooo much (it's a little late for that, I guess) because maybe it won't be your thing, but I personally loved it, and it's always nice to get to the AKL as well, I think. One word of advise is if you are using disney transportation, and staying at a different resort, you will need to be careful about getting back to your resort. What I would've done had I been smart was eat earlier at Boma and then taken a bus to one of the parks for EMH, and then a bus to my resort. As it was, we ate at Boma at 8pm. When we were done, all parks were closed, and we took a bus to Downtown Disney, and then from there another bus to our resort, which took us an hour even with no kinks and no waiting for buses.