Even with all the precautions, its usually not a good idea to take the path you expect deer to use to walk to your stand, even if that means taking the long way in.
Also, I think that a good part of the human odor that is detectable comes from the breath. We usually spend a lot of time and effort dealing with the clothing, boots, etc, but if you're breathing out, especially if you're not using a carbon mask, you're emmitting a huge amount of scent.
Access route is probably the least considered but most important consideration in a stand location.