The Disney resorts have staff at their front desk 24 hours a day. If you have something in particular that you want, then call right before you go, but otherwise you should just remember that Orlando has a big, busy airport where people land at all hours of the night from all parts of the world.
10:30pm isn't that late, we arrived once after 11pm and didn't find our hotel until 12:30 in the very early morning.