I learned to watch where I walk at an early age. I've come across quite a few snakes just walking around my property or Aunt's ranch; mostly rattlers, occasionally King snakes, and the odd copperhead or various "rat" snakes.
Only once have I not paid attention and stepped on one. Early last spring I pulled up next to the house after work. There was a HUGE catapillar going up the rock wall near my truck. I stepped out and walked towards the back door of the house, all the while looking at the catapillar. At one step, there was a rubbery feeling and an odd squeeky noise. I stopped and looked back, I had just stepped on a nearly 4' rattler. It just lay there on the gravel path, hardly a care in the world (I think the squeek was a forced, high pressure fart). I was surprised he wasn't pissed off, it had to hurt. Certainly don't want to deprive the gene pool of a laid back rattler, so I got a bucket, ushered him in, and relocated him to a brush pile at the back of the property. It's something I'll routinely do, much to the chagrin of my wife.
My favorite snakes are King Snakes. I'll see them sunning themselves on the roads more than any other. If I can, I'll always stop and chase them off. When I do that, they have a terrible habit of going, very quickly, towards the truck. 3 times now, I have had them get to the truck faster than me. The first time, my door was open and it whipped inside and under my seat before I could stop it. It was so far into the workings that I could not get it out. I had to leave the truck door open overnight so he could leave at his leisure. The other 2 times (once in my wife's jeep) they got up into the frame rails. Ended up driving home to let them slither out on their own. My wife was absolutely mortified, and truly pissed at me, with the one in her jeep. She sat in the back because she was sure it would come in through the air vents on the drive home. It's now one of her favorite stories. I've learned to stop further away.
Anyway, good post. I'm a firm believer in live and let live. I used to really hate the "rattlesnake roundups". Haven't heard of one in years, so maybe there is some progress.