While I've definitely done my share of substances, I'd say probably 60-70% of my parties I go to sober (other than caffeine). I learned early on that rolling too much too often doesn't do any good. I also went through a period where I thought I couldn't enjoy parties sober, but I corrected myself and all is well now.
I find it interesting that when I'm not sober at a party, I tend to focus less on the music and do things like talk to people, lightshow, and walk around/hang out. However, when I'm sober, I'm usually on the dancefloor almost the entire night.
