Well, even though this thread is a few months old- yes I wear a helmet! Honestly, theres so many styles and designs to choose from, why WOULDN'T you?
I have never actually hit my head from a fall, but being thrown off my greenie and seeing his hooves flying 3 inches away from my face is reason enough.
I don't understand how people can say 'it's my head, and I don't care'. ACTUALLY, if you get a head injury, and can not care for your horse (or work to pay for him) in a way your hurting him too.
Just my two cents, but to each his own.