I keep my camera on my helmet. I mostly forget it's there. One disadvantage is that I have it mounted on the side of my helmet, so sometimes if I didn't cinch it down well it will list to that side.

I recently started using a light on the top of my helmet, and everyone seems to think it's a camera. I've noticed lots of drivers suddenly stop for me (when they don't have a stop sign and I do, which is REALLY annoying) and occasionally when I don't even HAVE my camera on, pedestrians/other cyclists/etc will suddenly start acting goofy and mugging for "the camera." Also mildly annoying.