We've never had a problem dropping off carry-ons in our room. If the steward is still finishing up, we just leave them on the couch and get out of his/her way. However, after a few cruises, we've finally learned to economize our packing, so we don't have much in the way of carry-ons anymore. Just a backpack each, which is easy enough to tote around until after lunch and the reservations scramble.