I've only been carrying since June and really no situations have come up where I have needed to use or really thought about using my pistol until today. Minor thing but I was pumping gas at a convenience store (middle of the day) and I heard someone cussing up a storm to himself. Looked around and it was a young man on foot. I'm sure this guy had mental problems but I keep an eye on him.
I don't think my behavior has changed. For several years I've gone out of my way to avoid conflict, especially in my automobile. There's a bunch of nuts out there many of whom have guns or knives. I don't want to shoot anyone when it could be avoided and I sure don't want anyone to shoot me. Regardless whether justified or not, it's a life-changing event.