It's a trend with any game that allows level editing for the most part that has a community that's been on-going long since the game has ran out of steam for the average person. Everyone has played the game so many times to death they need some real challenge.
However, slightly off topic, but an excellent map pack for any game that I played a while ago was Death Wish for Blood. It's challenging on easy, but not enough where its enough to make me resort to cheating and honestly 100% the maps are above and beyond Monolith quality. It's 3 whole episodes too. Something to check out when you're getting tired of all the real 3d 😜
EDIT: verify the qdosfx error if you can. I think it said getspace overflow for me in qdosfx