Back in my working days I was a lineman for the phone company and wore high top climbing boots. One day I came down a pole and at the bottom of the pole I felt something hit my leg. I looked down and saw a piece of sagebrush move and then I felt it hit my leg again. I looked and saw about 8" of a 2-3' rattle snake sticking out from under my boot.
I don't know who left the fastest, me back up the pole or the snake after I got off of him. Then when I was about 10' up the pole I threw just about everything that I had in my tool bag at that small patch of brush at the bottom of the pole. I never did see that snake and when I came down I actually jumped about 6 or 7 feet out into a open area that I could see.
But when I head to Arizona in Feburary for the javelina hunts I am aware of the snakes and know that most will either be dened up or not far from it but I am aware of them. Even when we hike into the den site that we know of I don't worry too much about them.