Having a qb who gets rid of the ball quickly and a coach who gives the o-line some help by designing and running plays that take advantage of the qb's ability to make quick decisions is also a big factor.
As you and several others have stated, I must agree totally. Quick release playcalling and a quick release QB will make any oline look better than they really are. I'm not knocking the oline, just stating that it makes their job SO MUCH EASIER when the ball is released on time and not shuffling backwards looking for the -5 yard screen pass as you shuffle into the sack.