I really like "how long ago". It means something to me. I never trust timestamps to be in my own time zone, so I ignore them.
... I just noticed that forum post timestamps all include the time zone (PDT) so I guess I COULD pay more attention if I cared.
But as with dates, I'm too lazy to do the subtraction and risk having to add or subtract 12 hours for AM-PM. Pretty non-technical for a self-professed nerd, I know!
Laziness trumps nerdiness.