We always, always, always eat at Columbia Harbor House for quick service. It's our favorite in MK. This year on our second MK day, we had lunch at Casey's Corner and were pleasantly surprised! DH and I don't really love hot dogs, but we liked the hot dogs at Casey's Corner. Also, good service: DD spilled her chocolate milk and when they cleaned it up, the brought her some new milk AND cotton candy. Very nice!
We don't love BOG for a lot of reasons, but admittedly have never had the TS dinner.
Our best recent TS meal in MK was dinner at Liberty Tree Tavern. I have no complaints - everything was delicious - but if you're not looking for "down home" Thanksgiving fare, then it's not your place.