We've DW, DD(18), DD(13) have done it twice. Last year, it was just horrible. There were very few cast members around to help funnel people to the various stations. It was one big gaggle in the atrium. You could hardly move and there was no signage or anything to help steer you from one place to another. It was pure chaos. I was very disappointed and told the desk people that this was not how I remember Disney doing events.
Last time we did the Halloween Cruise a few years back, there were ropes and signage and more cast members who would be telling people where the next nearest stops were.
In our last Halloween Cruise, we just took a few pictures in the atrium, but that was it. We did not want to fight through the mob to get to the other locations, so we just went back to our cabin.