Yes, big gatherings can be stressful, depending on one's psychological makeup. They are definitely stressful for me. And since my siblings and I did not grow up with the Thanksgiving tradition, the stress it creates is even less fathomable to me. But my wife does have that tradition, so she has put up with it.
This year, after we discovered that there were only going to be three of us at the dinner, I made a offer that most wives find hard to refuse. Let's go out to a nice reataurant! And so we are.
This decision makes me feel a little bit like when I decided, a few years ago, to hire a lawn service. What a great feeling of liberation. Lots of fun, good food, and no need to look forward to being exhausted at the end of it. What more to be thankful for?