
I don't usually get involved in any "debate"-type threads, but I was also thinking the same thing as OP (that this could be a nightmare, because so many people "expect" magical things to happen to them at Disney).
However, if you read the long "Official Rules" page on the Disney site for this sweepstakes, it seems like they have a plan in place for giving out these prizes at the parks...My understanding in reading the official rules was that, every day, there is a designated "spot" and a designated "time". If there is one prize for that designated spot and time, then the person who (unknowingly) walk or stands in that spot at the designated time wins the designated prize...no discrimination. Clear and free, that person wins the prize because he or she met the parameters of the award designation. (I'm imagining something like...the person standing at the left side of the anteater exhibit at Animal Kingdom at 11:25 a.m. on such and such date wins such and such...

)
The official rules go on to state that if there are "several" prizes designated for the spot and time (they call it a "batch"), then a certain number of people win the same prize within the location/time parameters. This might cause more of an issue for "expectant-type" people - I have a vision of hordes of people running to that location once they see someone has gotten something
However, I'd like to think Disney has thought of these issues. I didn't get the impression in reading the rules that the cast members have complete freedom to decide who gets what (at least for in-the-park prizes).
Did anyone read the rules differently?

Oops! Am I allowed to post here? I didn't realize this was a DVC thread and am not a member

Of course, that will all change once I win the DVC membership prize from Disney