I started playing BECMI, which has no demons. or Devils. Then I switched to 2E. Again, no demons or devils. They had the Tanari and Bazaatu (I'm probably mangling those names), but they weren't really played up outside of a few Planescape supplements. One hardly ever saw them, and I never once used any of them in my games.
Then I switched to 3.5, and there were a lot of demons. Especially in th OGL stuff. I mean goodness, I have endless legions of unique demons at my fingertips.
I'm not saying it's good or bad, but I was wondering if anyone else is like me a Nick, and came up through BECMI and 2E and is a little "WTF?" about all the demons.