I have enjoyed many gluten free meals at WDW! Boma may have been the best of them all! Chef TJ was awesome. He made an absolutely amazing meal for me, and it was vegetarian! He also made an amazing meal for my daughter (10yo) and the dessert he served us was the most amazing food creation I had ever seen! (It had 2 slices of cheesecake, 3 brownies, bananas tempura and chocolate sauce all over it!).
Anyway, I have eaten many great meals there. The chefs at The Turf Club made excellent meals for me and my daughter, as did the chefs at the Liberty Tree Tavern, Hollywood and Vine, Tony's Town Square, the Sci Fi Dine In (our favorite), and the Whispering Canyon Cafe. We have had good meals elsewhere, but these were the best! Places that we did not get good service were Chef Mickey's and the Garden Grill (we had a great meal at the Garden Grill one time, and the next time they served me only plain white rice and plain broccoli! no dessert, no salad dressing - the chef obviously did not know what he was doing.).
Have a great trip and most of the chef's will go out of their way for you to have a fantastic meal!