OK, the fuller list now, with only one unmentioned elsewhere, otherwise in no particular order:
The Muppet Christmas Carol, which I just introduced to my favorite toddler
A Christmas Carol (Alistar Sim)
A Christmas Story
Home Alone (probably 2 also)
National Lampoon Xmas Vacation
It's a Wonderful Life
I have not memorably seen Elf, Scrooged, or Love Actually, if at all, but I have friends who have recommended all three.
Saw Polar Express for the first time a couple days ago, and wouldn't add it to the list, but no strong criticism of it.
Saw Bad Moms Christmas with what functioned as my COVID pod in 2020, and while I wouldn't recommend it, we definitely had fun that night, given the curated guest list.
Somehow, White Christmas and Die Hard have never made it into rotation. Probably means they're due for a fresh look, or Die Hard never registered as a Christmas Movie.
And finally, the OG for me...
Miracle on 34th Street. (The original one, not the Richard Attenborough abomination.) It is, by far, the best Christmas movie.
I'll close by circling back to mention that I claim "Bad Santa" as my favorite Coen Brothers movie (as uncommon a choice as some of the "my favorite UConn player ever" choices I've seen here), even though it is accurately the third of three consecutive fine movies directed by Terry Zwigoff between 1994 & 2003: Crumb, Ghost World, and Bad Santa.