After we did our personal information on line our tickets came with express check in stickers on the envelope. However, since you have to stand in the same line as all the other passengers on your /category/deck it may not help with the wait time. It does speed you through your process which will only take a couple of minutes.
Too bad they don't have a line for those who have express check in - no matter what cabin category you booked
Enjoy your cruise!