On friday I got clipped from behind by a skier as I was approaching the lift line, fell backwards, took a prety hard hit to the head. Hard enough that I heard a lot of ewes and ahs from the people standing in the line. I bit my toungue, tasted blood for like the next 5 runs. Actually think I had minor wiplash. Lower front of my neck still hurts today although it has improved drastically, and I had a minor headache Sat and Sunday....I had a helmet on, I have been asking my self what that would have been like without a helmet. It still amazes me that people wearing helmets in snow sports is the exception, it seems even alot of the pros don't wear helmets.
I understand in the really big crashes they are not going to do much, but like my incident from Friday I am pretty confident the helmet kept me out of the hospital.