I voted Used to but stopped. Even though I still put one on for races and when I go out to hit some sweet jumps and when I go riding high speed on snow and ice. So I guess my perfect answer is I used to for every single bike ride but now only do so for certain ones. Hmmm, from about 1974-1987 I never wore a helmet either. So my perfect answer was I started out never wearing one, then wore one for every single bike ride for about 10 years and now only wear one for special occasions.
Sorry haven't read the rest of the thread, I'll do so now, though.
Oh, I did get a "You need a helmet!" from a passing cyclist a couple of weeks ago. Pretty darn funny. I was chuckling inside but kept a straight face and said "I don't think I do." I should have added "You need elbow pads!"
Dude must have put the hammer down to catch me because I kept my same average speed up this long grind of a hill and passed him about a half mile later.