At least in the 12 man, we end up using the "back half" as sleeping quarters (with that door never being opened) and the "front half" as living quarters where the drippiness is less of an issue -- unless you're the guy sitting right there.
That sleeping arrangement leads me to appreciate Seekoutside's minimal rear door that is more for ventilation than access.
I also share Patrick's paranoia about not getting "cabin fever" as the old timers called it. No doubt in my mind that leaving the bottom of the door unzipped three or four inches will yield considerably more airflow than 7 feet of closed zipper teeth.
