In the last 10,000 miles I had no accidents. In fact, I had none in the last 50,000 miles. It is a big question if any of what you mention here would be as much as a touch, if you did not have autopilot in the first place.
That's fair. In ~200k miles of driving I've also had zero accidents so maybe it's a stretch to call these things 'tragedies avoided'. But the point stands that Autopilot does little things every day to improve safety, but they get little media coverage since they're mundane and boring.