This isn't a specific word or phrase, but it makes me sad to hear/see people talk about how "busy" and "stressful" the holiday season is. It's like it's just accepted that this time of year is terribly stressful. I don't see where the stress comes from. Is it having to see family members you don't like? Is it having to buy gifts that you don't want to buy? Is it having too many people in your life who love you enough to invite you to their Christmas party? All of these things seem avoidable and/or manageable. If you don't like it, change it! I love this time of year, and I don't find it at all stressful. It seems that people bring the stress on themselves and feel proud of it, almost like the way being "so busy" is a badge of honor these days. Sad.
I agree that "busy" and "stressed" are overused.
That said, I can point out a few reasons why the month between Thanksgiving and Christmas is more stressful than normal, at least for our family. We're already pretty darn busy in the base case, but a bunch of extra stuff comes up in those four weeks. Kids have band/choir/orchestra concerts, with the attendant extra rehearsals. I sing with a barbershop chorus, which has its own rehearsals and performances. Shopping for Christmas presents takes time. Baking and delivering cookies takes time. All manner of Christmas (or other holiday) parties happen. Everyone and their dog starts some sort of charitable giving project. I somehow found myself constructing a manger for a nativity scene. Oh, and it's now cold enough that DW has to drive kids to school instead of them riding their bikes. BTW, next week, so-and-so is going to be on vacation, would you be willing to cover for them? Now, add on all the year-end stuff and we're-about-to-start-a-new-year stuff and final exams in school and so forth, and it gets pretty nuts.
Basically, it went from "busy but manageable" to "holy cow what did we get ourselves into?!"