A plus of self disembarkation is that you can wait until morning to finish packing your stuff, no setting out the next days clothes and putting your jammies (it you don't wear them I don't want to know about it) and toiletries in your carry on. The only time I paid attention they let groups 1 - 3 off the ship ahead of the self assist. Maybe the key to self assist is not to be in a hurry and wait in a long queue trying to be the first off the ship.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014