My owner's manual even says that it's safe to overfill the engine by one quart if racing the car, so I see no reason why I can't continue to run that extra quart on the street. I've owned the car over six years now and have overfilled it the entire time with no problems at all.
As far as not checking the dipstick, that's because I have found it's ridiculously inaccurate on my car. For the first couple of years I owned my car I never thought it burned oil because the dipstick still showed full at the end of the interval, but then when I started measuring how much oil came out, it was a quart low. So from now on I do not trust the dipstick reading, so there is no point in checking it.