Beth,
Yes, they let you board first. When you get to the terminal look for the concierge check-in desk. It is at the far end near the mouse ears. They will tell you after you check in to relax and sit on the sofas next to the mouse ears and when they call for the handicap people to board you can also board at that time. You will have a different colored KTTW card than everyone else so they will know you are concierge. Except for the 3 handicap families in front of us, we were the first to board. When we cruised in March we started boarding around 12 or 12:15, so even though your DS wants to sleep in make sure you are there no later than 11:00 if you want to board first.
LeiLani