Eh, actually we have a pretty good idea of what this storm would do at Disney World, and really, it isn't THAT bad (from a catastrophe standpoint; clearly it can ruin a 3 day weekend at WDW). The worst cast scenario for Disney would be the track shifts west, it makes it into the Gulf and then turns north into the peninsula around Sarasota or Tampa. That would put Orlando on the bad side of the storm and give it less time to weaken over land before the core of the storm arrived. However, this scenario is pretty unlikely given model output at the moment.
A much more likely scenarios are this thing comes in due south of Orlando in Monroe or Dade county and tracks north up the peninsula, weakening for 8+ hours before the core hits Orlando. Perhaps even a more likely scenario is the storm rides up the east coast of the state or just offshore like Matthew. In this situation, it is entirely possible WDW would never see hurricane force winds.
While these scenarios would make it a bad day to film a commercial for Disney World, structural damage would be largely minimal, especially to well-built structures... which I feel pretty confident that Disney's hotels are.
tl; dr: Both Palm Beach and Orlando may make out okay, but Palm Beach definitely has a higher risk of being devastated. Evacuating from Palm Beach to Orlando makes a lot of sense, even if you aren't planning a WDW trip.