Regarding the initial setup of the beds, on our first cruise, the booking agent at DCL asked me how I wanted the beds configured when I made the reservation. On subsequent cruises, they just took all of the passenger info from the previous trip and plugged it in to the new reservation. The bed information may have been part of that, because I was never asked a second time.
However, each time we've met the stateroom host/hostess for the first time, they have asked if the bed was set up correctly. As Dave mentioned, it's probably hard to get every special request taken care of in the time they have to "turn around" the ship. This seems to be the case with life jackets, too. They try to have the correct number and size for everyone in the stateroom, but they don't always. The stateroom hosts do take care of these types of situations quickly and efficiently.