Was just about to post this, glad someone else did.

I have a car with both (birds eye view and parking sensors), and they are absolutely complimentary to each other, and I use them for different reasons. E.g. for squeezing through my garage door (I only have about 1.5 inch of clearance on each side) I like the birds eye view, but then when I pull up to the front of the garage I use the sensor because I know exactly how many inches from the front my car should be so that I can both walk around the front and the back if I need to unload stuff from the trunk.