Hmmm I know I posted on this the other day...
Both of my builds only used 1 door. The first lil vardo had a passenger side door, and the 2nd lil vardo had a forward faceing door. I think its an interesting idea but I think most people do tend to regularly use the 1 "main" door and occasionally use the 2nd door. Look at peoples photo's of their camp setup, most have an awning or something set up on 1 side.
I guess Bob made a good point, if your the last one in, first one up then 1 door isnt a big deal. I dont sleep a whole lot, and have never dated anyone who slept less then me so Im not worried about it, and I think if my partner was moveing around I would wake up from that.