Flame Tree is the only place I have eaten and probably the only place I ever will eat at AK. It is really good and different than other QS you will encounter so I like the variety.
We loved Flame Tree - so good, and just a huge amount of food. Even my daughter, who at nearly 9 years old wasn't impressed with most QS kid menu options, enjoyed her chicken legs.
The birds were a little annoying, but hey, animals in Animal Kingdom, it fit with the park theme .
I enjoy the Y&Y, but after a couple of lunches in the heat with NO shade. We went back to FT and Pizza. FT has shade. Pizza has AC. Depending on the heat, depends on our QS favorite for the day.