Regenerative braking means that your regular brakes are used much less.

Not using your brakes isn't actually that good for the brake discs, since they can rust with the lack of use.

No less than with a manual transmission car. I went 5 years before replacing the pads on my last car, with 150k km driven—not because they were worn, but because they were falling apart.

I haven't driven an EV yet, but from what I hear regenerative breaking is much stronger than engine breaking with a manual car and can essentially bring the car to a stop in city traffic.

I drive a diesel. Back when I had a regular freeway commute, I would regularly come to a complete stop at the end of freeway exits without touching the brake pedal, just for fun (last few km/h I used the handbrake). And one time when I was randomly pushing a little too hard on the brake pedal when I was parked, I burst a brake line somehow, and I ended up driving 20+ miles to my mechanic on busy city streets with no brakes, safely.

I doubt regenerative braking is any stronger than that.