tykinruoka: Yes I did :-) Me and my friends made some of our own levels/WADs when the very first editors were made available. I spent many many hours with Doom and there are lots of good memories.
Vythonaut: Cool! I've been into modding myself back then (StarCraft & Viper Racing), though i don't think there's any of it available today. By the way, are your WADs available somewhere to try them or were they made just for your personal fun?
You may want to check (if you did not already) the documentary miniseries
High Score (available in Netflix) The last episode talks about Doom and the phenomenon it was
A good miniseries, it starts with Atari and gets to the beginning of 3-D games
It deserves to be in the GOG video service as well...