I am in the "leave snakes alone unless they are in the yard" camp. My DH has even intentionally brought home king snakes he found and turned them loose in the yard. People say they eat rattlesnakes. On the rare occasion that a venomous snake is in the yard, either my DH or my son kills it. I mostly point and give instructions.
As far as out on the trail, my horses smell them and hesitate. They won't walk over one. The most dangerous snake encounter I had was due to the horse over reacting to it. I was cantering up a hill on a dirt road. At the top of the hill, we almost ran over a rattlesnake. He coiled up and went to rattling. Then danger came when my horse did a 180 turn and galloped as fast as she could. She went off the road, jumped ditches, downed trees, and other things. She was totally out of control. That was many years ago. Obviously, this horse was not ready to take on trails. Somehow I didn't get hurt.