Yeah, I've been QDing the drivers after most washes. Not only leaves things nice and slick (and a little better protected), but also provides some added lubricity in case some dirt shows up when I'm drying (all sorts of stuff can appear when I use the compressor to get water out of nooks and crannies).
I would't do the carwash idea, just too great a chance that abrasive dirt would be left on there and mar when you wiped it off. I've done such things before and while it's better than just a regular wipe-off it's not what I consider optimal. It's the sort of thing I do with service loaners and rental cars and it works *fairly* well if they were recently detailed/waxed and weren't too dirty before being run through the car wash.