If you have the sticker, go to the "Express Check-In" line -- even if it appears to be longer than another. The "Express Check-In" line moves very quickly, partly because the passengers in it require very little processing (you sign for your shipboard account and they hand you your cruise card -- that's it!) and partly because it gets priority service at the counter, so it will get you aboard ship most quickly even if it is considerably longer than the other lines. The other lines are for passengers form whom have to process additional paperwork because their information is not complete. The additional paperwork may take a while, depending upon what's missing, so you really do not want to be behind those folks.