I think I commented on the thread on this question on HN, maybe, but I /tried/ to use Elisp to solve Advent of Code last year! I mostly stopped b/c I didn’t really know programming too well, not b/c of elisp. Repo here, if you want to see some big Org files.
I used Elisp for the challenge because I did a lot of it at work, where the most easily-accessible programming language on my non-admin-permission computer is Elisp through an Emacs Windows portable build.
oh, neat :)