yeah I do know what bleeding brakes is, I bleed the brakes on the racecar before every event, I also index the rotors (front only) at the same time. I also do a complete flush at least once a year. I've even made and installed my own brake lines before, and miracle of miracles they didn't leak I'm not saying you shouldn't do it, in fact it is a good idea to do it when you change your pads regardless as you then know it's been done on a regular basis, but I've never had to bleed the brakes just because I've put new pads in. I've never experienced air in the system due to pushing the pistons back. But agree that's not to say this couldn't happen, or wouldn't vary from car to car.
More importantly as a mechanic I would expect you would never hand a car back to a customer without having done a brake test and a road test, in which case you would quickly identify the need to bleed them anyway.
swapped out the front discs and pads today and brakes like a dream 
