First, welcome to cruisemates! I'm Michael.
Second, yes, you do meet your cruise friends again, sometimes by just arranging a meeting, other times by sheer luck of picking the same cruise. From the 14 cruises I've been on, I have kept in touch with some people from as far back as 2004, and even dated this one girl from one of my two cruises in 2005. All in all, I still talk to people from past cruises; its always fun to keep in touch with the people you spent X amount of days with