We run into the occassional Rattler and a few other non-venomous snakes. But we don't see a lot of the because of the elevations we ride at. When I ride in the desert, it usually winter and spring and the snakes are holed up that time of year.
The 2-3 times a year I come across a rattler, I just give it room to slither off.
A funny story, One day we were really booking down the trail, A rattler was laid out sunning on the trail, as we roared by, It attemped to curl up from it's stretched out position. The horse and I both saw at as it started to coil up, but we were already on top of it. It got wrapped around the horses hind leg and as the leg came forward, It got whipped about 15 feet out ahead of us. Of course , we were way past it by time it recovered from being thrown.