This is a difficult question. Why? Because there is a difference between "sold" and "no rooms available". Allow me to explain. In very resort there are a number of rooms that are set aside for travel agents, VIP's, etc. Disney can sell the set aside rooms, but only at the last moment if they are transferred back to CRO. Yes, I am sure there are times when all the rooms available to the average guest are sold, but I doubt the occupancy rate has ever been 100% (due to illness, death, etc. that occurs in families; weather and/or convention guests that do not show up) at all the resorts.
Originally Posted by JEDIPRINCESS
As for the parks, as a resort guest you always have preference over a guest that stays off-property. The parks were frequently full prior to 9/11 and the gates were closed, but resort guests are accommodated, even if they have to wait awhile for the parks to clear due to safety concerns.
Hope that helps.
Lord High Keeper of the Knowledge of Right and Wrong, Counselor in Moments of Temptation, and Guide along the Straight and Narrow Path and Oldest Active DWT/WDW Radio Member
DL: 1955* (1); WDW: 1977* (2), 1980* (2), 1985* (3), 1989* (3), 1996 (ASMu-3), 1999 (ASMo-3), 2000 (ASMu-2/PO-2), 2001 (ASMu-5), 2002 (ASMu-5), 2003 (ASMo-5), 2004* (8), 2004 (ASMo-8), 2005 (PC-10), 2006* (15), 2007* (20), 2008* (22), 2009* (26), 2010* (27), 2011* (32), 2012* (39), 2013* (36), 2013* (15), 2013* (9), 2013* (13), 2014* (23 so far) Total Trips/Days = 25/339