A few years back I got hit in the head by a hawk at 60 mph. Its the hardest I've ever been hit by anything. I literally saw stars. I remember rolling my head forward and opening my eyes (don't remember closing them). My first thought was, "I'm still on the bike!". It whiplashed me, which still gives me problems periodically, but otherwise I was fine. I'm sure if I had not been wearing a helmet, I would have been concussed at a minimum, and possibly dead. I most likely would have crashed the bike. I can't say the helmet saved my life, but it sure helped prevent additional injury at 60 mph.
I understand why riders like to ride without a helmet. I myself prefer an open face helmet, but wear a full face for the protection it provides.
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