Beautiful picture! I worry less about snakes than two legged animals, but I have some bias because I've been around snakes all my life. There is evidence that many strikes at humans are "dry bites" and not full loads of venom:
http://www.whmentors.org/saf/snakes.html We came upon this one while we were hiking in NJ two years ago:
It was pretty calm (on a fairly cool day) and was sitting in the middle of the trail. I was wearing my hiking sandals! I am very aware of where I step. We took our pictures and it never moved.
This one was on the Appalachian Trail in Virginia at the site of the October 1978 Navy fighter jet crash into Bald Knob:
He was considerably more tweaked.
At any rate, they worry me much less than other dangers like falling (which I believe is the #1 cause of backcountry accidents).
- Andy