It was a good social outlet for me because I have a pretty severe mobility impairment and, long story short, small groups and laid back activities are easier for me to participate in than other things.
I haven't really gotten back into in-person stuff post-COVID, but I still enjoy making November a time to write and hanging out in the local NaNo Discord server. I enjoy perusing the NaNo forums, particularly the Adoption Society, where people offer up plots, characters, running gags, opening lines, chapter-naming schemes, and more for anyone to use.
There's also a bit of fun lore that has developed. For example, if you're stuck, kill a character with the traveling shovel of death ("traveling" because us Wrimos are passing it around). Or find a way to include Mr. Ian Woon (anagram of NaNoWriMo).
NaNoWriMo is different things to different people and I love that about it.
This year and last, I lowered my goal to writing a 20k-word novella. I have difficulty typing and a lower word count makes it a bit easier for me (that makes me a "NaNo rebel" lol I love all the little jokes and stuff).