You still have to cross at intersections and driveways. I've been hit multiple times (at low speed) by motor vehicles crossing the sidewalk at a driveway. I don't ride on sidewalks anymore.

This sounds like a speed issue. If you’re doing 20 mph on the sidewalk then yes you weren’t in view when the driver started backing out of their driveway.

I don’t fully think I’m a bike I get right of way. If I see a car reversing ahead I move into the street then prepare to full stop but proceed with caution and watch the cars acceleration to see if they see me. If I get the hint they don’t. I stop. It’s scratch on the bumper for them and life for me I am more than glad to yield.

Cyclists here (in Seattle) have a healthy habit of calling out "to your left" when approaching from behind. Things like this need to become more widespread.

I do that regularly on my commute on a mixed-use trail. Half the time the pedestrian looks to their left and their feet follow. The other half have headphones on so they don't hear me anyway.

I might be exaggerating a bit.