For me, tops is the language.
Without the "Oy veys" and "L'chaims!" and "Oy gevalts" and so, even just snippets of Yiddish... I don't know, wouldn't feel right. Most folks go "uggghhhhhh...", I go "oyyyy...."
I've been doing that since before I can remember, just picked it up from my grandparents.
It's not so much "oh, man" as "oy vey...", if someone hits their head I'm ALWAYS instantly hearing my grandmother say, from way back, "Oy, did ya hit your kepella?"
So yeah...
Holidays, even just remembering them...
And the FOOD! It just doesn't feel righ around the holiday season without a good batch of latkes (if you've never tried them... ah... I can almost taste my grandmother's, homemade, she learned it from HER mother, and back and back...)
:)