To answer the above question:
An Orbitz ticket voucher will not be added to your room key upon check-in at a Disney resort and you will be told that you must redeem it at the Will Call window of a Park. Apparently, Disney exacts this punishment for not buying park tickets from them (Orbitz offers a 5 day ticket for the price of a three day ticket).
I took the boat from Riverside to Downtown Disney and and redeemed the voucher at Guest Services there--no line, no wait.