Sorry to hear about your sons diagnosis.
When we've traveled to WDW with our now 12 year old (diagnosed at 16 months), we've managed to lose his MedicAlert bracelet during one trip and his glucose monitor/glucagon/supply pack during two other separate trips. The wonderful Disney staff was able to get the pack back to us quickly both times because we put address labels on everything and they tracked us down since we stay on site. Since these occurances, we bring an extra bracelet and the extra meds pack that we keep with the nurse at his school, as well as extra adhesive address labels.
As for standing in lines or any other type of waiting, we've had great success avoiding "lows" for eleven years by carring with us several of those little single serving size bags of fruit snacks (Farleys, Brachs, Betty Crocker, Nabisco, etc.) that you can get by the box (8-10 per box) in the granola bar/pop tart/fruit roll up section at the supermarket. The kid likes 'em and they work pretty quick. "We don't leave home without 'em"!
I noticed that you are in Connecticut. Our son has gone to Camp Joslin in Charlton, Massachusetts for a couple of weeks during the past several summers, he looks forward to seeing his old buddies every year and meeting new friends. Although we do miss him while he is there, it has been absolutely wonderful for him, and we cannot recommend this experience enough for a young diabetic.
Best wishes to your son and your family at this tough transition time.
Sue