Thanks so much for the replies!
We did go to Gregory's for Thanksgiving dinner and, unfortunately, would not go again. Quite expensive for the "ok" buffet food, and service was terrible. We were placed at a table right by where people had to get their plates and our friends (who had their backs to this area) were constantly bumped, asked to move their chairs in, and at times I thought were going to get food spilled on them. Our waitress (if you can call her that) had to be asked twice to bring us glasses of water, barely acknowledged us once we got our food, had to be tracked down to get us our checks, and screwed up our checks (charged us full price instead of the senior discount price even though we mentioned to her that we were to get the senior price before she even brought us our checks, so checks had to be redone), and then we noticed that our checks had an 18% gratuity already onto them. I'm sorry, but I'm not in favor of restaurants who automatically add tips to the bill. We are normally high tippers when service is good, especially during holiday seasons, but would definitely not have paid 18% for the bad service we rec'd. Tried to talk to manager, but place was packed and we never did see him/her and finally left. I don't think Gregory's normally does buffets and this would probably be a decent restaurant during "normal" times, but I don't plan on giving them a second chance.