I used to pack too much, however after my first trip to Europe many years ago, I realised I only wear the same few clothes all the time anyway, so generally pack about half what I used to.
Last time I went on a cruise however, I did the same -wore the same few clothes and could have packed far less but on a cruise I get worried that I cannot wear the same thing every night, but after one day at sea, I didnt care what I wore!
Couldnt be bothered getting dressed up.