I just want to agree with what the others have posted. I was diagnosed with diabetes at 12 and have now had diabetes for 25 years. I have been on the insulin pump for 9 years and it has changed my life. Greatest thing EVER invented! I'm sure your son will be on one VERY SOON.
For now, enjoy your Disney trips, they don't have to be much different than before. Like the others said, check blood sugar very often (at LEAST every two hours) and keep snacks on you and/or your son AT ALL TIMES for those insulin reactions that hit without warning. (I learned that the hard way, thinking, oh, there are food carts everywhere, I can always buy something. Not so when you're stuck in a show somewhere!)
I know you feel like your life has turned upside down. I remember when I was diagnosed my mother used to say "I feel like I have gone through a college course learning all this stuff." I was near your son's age when I was diagnosed, so I know how he feels. Just give him time to adjust and don't do everything for him. The single greatest thing my mother ever did for me was to make me do it myself - shots, glucose tests, etc.
Good luck and let us all help you with anything!