Note that not all outbreaks are documented on the site. We were on a January 2011 Wonder cruise where our friends all came down with this virus, along with every cabin in their aft hallway. The medical center wouldn't see them, possibly to prevent documentation. The stateroom host refused to enter the stateroom the second day after finding out the 2nd person in that room was ill. They had to fend for themselves grabbing towels from the cart down the hall and piling dirty linens outside of the room hoping they would be collected since no host was entering any of the rooms in that section of the ship. Everyone else had linens in the hallway as well. Someone got sick at the muster drill when we were in AP. When we returned home, I saw on the DIS that the previous 2-3 cruises on the Wonder operated with the CMs manning the buffets & drink stations.
DCL made the decision to lift that on our cruise and obviously hadn't cleaned the affected areas enough. Before you harp on the linens in the hall thing, picture yourself with 2A2K in a cat 10 for 3 nights with no clean linens, the trash not emptied and up to 3 of you ill at one time.