I remember there being an "Is It Type Related" subforum at some point. That would have been a more appropriate place for this topic, but whatever.
I find that I always consciously consider what the most tactically advantageous position in my surroundings is. Back to walls, away from corners, facing enterances, everyone in peripheral vision, valuables and people I've deemed as potential threats in clear sight, etc. I can allow myself a disadvantageous position without much discomfort if doing otherwise would require being awkward or inconveniencing people.
I do think about it though.
I've also found that when dangerous situations appear, no matter what I've decided I would do in advance should such a situation occur or what the safest thing for me to do would be, I always end up running right into the situation with whatever makeshift weapon may be around me.