Caveat - Boma - for *DINNER* - is my favorite restaurant in the universe - not just the "World". I like the variety, the quality, the ambiance, and the service. There are, though, folks who don't like it, many of whom find almost all the dishes to be too sweet. (That's not my experience. Different palates, I guess?)
I love the setting of Whispering Canyon, right in the fabulous lobby of Wilderness Lodge. The atmosphere is fun, and the food is tasty, but my wife and I don't care for it all that much because most of the meat is smoked. If you liked smoked meats, it may be for you.
Also, it was the case at one time that the served a bottomless milk shake - the only one I've ever seen anywhere.
If you're looking for an out-of-the-way hidden gem, you might consider the Turf Club at Saratoga Springs. It's not elaborately themed, but it is very attractive. Seldom is it crowded, which tends to result in better service, and you can often get a last-minute or walk-up seating. The food is not "exotic", like Boma, it's pretty standard fare. But it's really *good*. Just across the river is Downtown Disney, reachable by boat, if you want an evening's entertainment before or after dinner.
If you want something in the Magic Kingdom area, The Wave at the Contemporary is good, although some might consider it a little "frou frou". Not usually as wide-open for seating as is the Turf Club, but reservations are usually available even a few days in advance.
Another option for a good time - Boatwright at Port Orleans Riverside. The food is not exceptional, but if you time it right, you can have a great time afterward in the lounge with Yeehaw Bob. I can't remember the specific times he performs, but my experience is that almost everyone will have a good time at the show.
Something here ought to fit your needs.