On the Rotterdam, we also got the laundry back the next day. We did alert our steward in the AM that we had laundry to be done, and he took it right away.
We left our bag on the bed and when our steward made up our beds and cleaned the room he took the bag. The next evening when we came back to our room after port they were all there on hangers waiting for us. They did a good job as well.