I agree the overwhelming majority of drivers are courteous and look out for cyclists. In fact some are way too helpful; thus causing a problem.

I was riding in a local area where there are many STOP signs. All of them faced me with none on the crossing street. With approaching cross traffic I didn't bother to unclip. Instead I did a track stand, intending to proceed after the motor vehicle. that had the right-of-way passed. I was foiled and darned near fell into traffic when I had trouble unclipping and simultaneously balancing the stationary bike when the driver came to a halt. Don't know about other folks; but I found it difficult to balance a stationary bike, not crash and wave him on; all at the same time.

Apparently experience had taught that driver cyclists couldn't be trusted.