Even with good rear view, I find the backup camera super useful. In fact on my car I wish there was a way to have it running no matter the shifter position; I have a Ford Escape and the car must be going in reverse for the camera to activate. The most useful feature are the guide lines overlaid on the video that bend according to steering wheel position, and crosshairs that let me position my hitch to within half an inch of a trailer coupling.

Luckily the NHTSA is requiring backup cameras on 100% new cars by mid-2018.