[Video] Should you organize before or after a move?

To make a long story short:

Organize before a move.  As stressful as moves can be, imagine the stress that will hit when you're unpacking bags and boxes of loose paper and detritus.  Imagine seeing what I see all too often as an organizer:  bags and boxes of detritus that are unearthed a decade or more after the move!

Have you ever regretted not organizing before a move?  If you have a move coming up in the near future, what organizing projects will take top priority?  Do you still have remnants of moves past that you're now motivated to organize, even if the move was years ago?  Please share thoughts in the comments!