I believe that most of the time I will ride with a helmet on also but when stuck in a slow moving "parade run" on a hot day now I have the option of removing that noggin cooker....I saw my first one yesterday. It was WEIRD! I don't plan to ride without myself, but I suppose it's nice that now there's an option for those who want it.
And they usually invite friends after a while. I'm finally back down to one bike, but, for a number of years had 6 of 'em in the garage...all of 'em fighting to see who'd get to go out that day.