I take the stairs because elevators make me motion sick.

I do use escalators and people movers when available or necessary (at airports, primarily) but it drives me UP the WALL when people get on them and just stop. I guess if you have a rolling suitcase, walking up the escalator doesn't work very well but I just hate not moving on my own power. I'll walk rather than take trains or buses between terminals when I have the option - sitting on the trains/monorails (at DFW, especially) just makes me edgy.