I've been using a shelf-type, hangs on the closet rod, shoe organizer for years. On long cruises, I take TWO !!!
I've never tried the hang-on-the-door type.
One organizational hint is to score a money cup from the casino ... that's where you can toss your room key/cards, extra chips, the earrings you took off and were too lazy to open the safe to put away, spare glasses, etc. I refer to it as "The Container" and consider it essential to good cabin-keeping.
It's amazing how "stuff" can just accumulate in the cabin when you aren't paying attention.
pamda -- CM First-Time Cruisers Editor