I have never cruise more than twice in one year. We only did that twice.
We usually cruise once a year and since we do many other trips, I don't expect to do more than that.
Carnival Liberty New Year's Eve 2007
Liberty of the Seas 5/2008+11/2009
Allure 1/16/ 2011
Independence of the Seas 12/29/2013 Top-notch!