Buy yourself some extra batteries and a charger to charge the ones you used each night. When you are at Disney you want to get the right picture and you end up taking more than you need, because you don't know if you got good shots. With a digital camera you will know! In addition, we would show the pictures to our 3 yr old while we were waiting for our food at restaurants to keep him occupied. He really enjoyed looking at the pictures on the camera.
In addition, when we got home we made a slide show of the digital pictures and my family likes to look at our Disney Slide Show. It was easy to do. I bought an inexpensive software package that made it fun to do.