Janet, having done a fair amount of both, I think Paul's chiropractor may have a point. In navigating by the stars or in tracking, the person is usually looking either up or down primarily with the eyes and with limited head movement. Maybe that accounts for why my neck hurts if I get stuck in the front row at the movies. I think that we all have a certain range of motion up and down, but we seldom get called to move to the outer limits of the range. As a nurse you would know the C spine far better than I would though so I give a lot of weight to your opinion.
Getting stuck in ANY position is no good. Normal ROM should accommodate up and down MOVEMENT with no damage.