In reply to DrNathanJSmith:
Toilets. Sit down, flushing toilets are what I appreciate the most after returning from expedition! Even more so than hot showers.
On a more serious note, this is an interesting area of research. When I've returned from big trips I've suffered from 'post trip blues', possibly a mild depression. Most of the people I know, who've gone off on big adventures, seem to have experienced something similar.
I think it's a combination of having achieved an objective, sometimes having had sublime or surreal experiences on the trip and then having to return to what seems a rather pointless and boring every day life.
Nathan, Could you please write an article for UKC, based on your findings? I'm sure many of us who 'lurk' on here would it find it interesting.