Many times the fire doors are blocked off and you can't get to your cabin for a while--remember they have to clean up after the several thousand that just got off a few minutes before your several thousand got on so they need time. It's not fun to try to tote, drag and pull all your belongings up and down stairs, the buffet, the pool area, etc.
Take a small carry on with your personals--use a larger suitcase and let the porters handle it. Luggage is in general, delivered pretty quickly considering the thousands of of pieces they have to handle.
No need to put yourself through the stress and aggravation of being stuck with several small pieces of luggage for 2-3 hours.