I have seen some pictures in trip reports with people on the bridge.
I asked in October 08 and was nicely informed that they can't accomodate a request like that anymore. But, they did give my name to the chief engineer and he called me in my room one night and we talked for close to an hour about the ship and what it is like to work on one. He definately said I should try to get a job about a year before the new ships come out. Since I am an electrical engineer, it is tempting, but I'm not sure about being away from the family for that kind of time.