yes, that is the trick. Also once you unpack, you can unmroll everything, lie them flat if they still hyave some wrinkles and pkace something heavy on them to flatten out any wrinkles that crept in, or use Downy Wrinkle spray or hang them in the bathroom and steam it up in there.
If it's casual clothes don't worry about it, for nicer stuff (for dinner, formal night) use the above tricks, or just make a quick trip to the laundry room to use their iron or send a formal dress to be pressed by the ship laundry.
I didn't care about the casual stuff and when yo9u unroll them the wrinkles eventually come out using the above tricks. I used a formal night (little black low-cut)dress that is made of soft velour and it never wrinkles, always looks fantastic.