Can't agree, Crab. Never take the quick way to the cockpit door. A panel left unlatched can kill, and has done.
Secondly, being still in the mob, you have always led a sheltered life with "engineers" to do your aircraft level checks and replens etc and someone else to sign as having checked. Not everyone has those luxuries. I'm not in a life saving role these days but often the need to get airborne can still be pressing. I have no-one to do stuff for me these days so no-one but me should open any panels once the aircraft is out on the tarmac. But it has been known for some helpful soul to open and not shut. Also, I might get interrupted in mid-check and forget something, so a final pre launch look-around gets done every time as far as I'm concerned.