This may yield different answers ... depending on what is condered a SHORTER cruise. Here it goes for me ...
Comparison of 7-day to 14+ day:
More onboard ship tours, and behind the scenes events
Relax on deck 4 or 10 ... never had time for this on a 7-day cruise
VEG-OUT on the plush leather chairs on deck 4 & 5 (instead of sitting there, in line, waiting to talk to DVC or
DCL (booking))
A chance to actually USE the gym
More time to watch movies in a fabulous theatre
Order room service - just for the heck of it (Mickey Rice Krispy bars, with chocolate ears - what were the others I was supposed to order?)
More chances to have breakfast in Lumiere's
Secret deck #___ (shhhh!)