Depends what ship you will be on. On Sensation there were no hair dryers, but on Spirit they had this neat little hair dryer right in the desk drawer. However if you have long hair these don't usually work too well. I used it on Spirit but my hair is really short and it was fine.
What ship are you going on? Stop back and let us know how it was. Have a great cruise.
Even if the ship has a hair dryer, they will most likely be attached to the wall in the bathroom. A hot-and-steamy-after-a-shower tiny room is the last place I want to try and dry my hair. So, I always bring my fold-up dryer.
The one on the wall though makes a great bathroom heater! Just let it "dangle". <G>
Thanks everyone. Tweety, I'm going on the Inspiration this time. Western Carribean is my DREAM trip since I was a teenager. Can't wait. Looks like I'll be taking my own blow dryer and I'll visit again to let you all know how the trip was.