Jobob, I totally understand what happened to you. I am even more vigilant when driving now. Quite a few years ago, I was stopped at a 4 way stop sign in my car, going straight. It's a well used, but "country/suburban" road. A cyclist was facing me, and gave no signal or idea of what he was doing, so I assumed he was going straight across, as I was, just in the opposite direction. The 2 cars going through on the cross street went, so I started to go, and then had to slam my brakes because the cyclist turned left in front of me.
I was a wreck and he was swearing at me, but when I analyzed it, he did the same thing drivers here do. Don't use signals at all. When I am at a 4 way stop on my bike and stopped, I keep wagging my finger, especially if I am turning left. My friends say I look like a nagging schoolteacher, but hey, since I used to be one of those, I don't care.