[bentcorner]

As an aside, do most people do the "stare away from the screen and keyboard" shuffle when sitting with someone who is logging onto their computer?

I do it (make a point of not facing the keyboard & screen of someone typing in their password) as a point of politeness, however in retrospect I find it a little odd. I've noticed other people doing it too (and yet when there is a presenter logging into a machine, nobody cares as much).

[mildtrepidation]

Yep, definitely. In my opinion it confirms a very basic expectation of trust between you and whoever's at the keyboard, assuming they're astute enough to notice (and concerned enough to care). If nothing else, it's a simple expression of courtesy.