Preparing meals, figuring out what to get people, how much to spend on each, then finding and buying presents, wrapping presents, and then when they are unwrapped come the apologies:
"If you don't like it you can take it back." "I guessed at the size, you can take it back if it doesn't fit." "I hope you can use it, if you can't you can take it back." "I didn't know what to get you, you can take it back for something you can use."
Visiting with relatives, hearing about the new cars, motorcycles, promotions, kids, remodeling, jerks as bosses, jerks as contractors, jerks as neighbors.

And then the clean-up. I used to always do dishes as a way to avoid the post-prandial drunken messes.

Big parts are enjoyable. Seeing relatives, seeing old friends is invaluable.

I have developed what I think is a great system for presents the last few years. I buy a bunch of Christmas sacks, a bunch of 2# loaves of the best Tillamook cheddar cheese, a box of crackers and a package of smoked salmon. I have a bunch of these sacks and pass them out to folks. They are always appreciated, cost about $20 bucks apiece, and are appropriate for even the wealthiest of my friends.

No worries, no apologies, no wrapping, no fuss. Carry a pen and fill names in on the cards I've attached and I'm set.