Why? It was a hurricane last year. Which is rain. (and wind etc) but my point is, why do people let last years forecast and events, effect this year travels. There is no reason to believe in any real way that this year will see a hurricane. In fact, the odds of you traveling to Disney and getting your vacation ruined by a tropical storm or worse are very, very, very small.
Now if people don't want to go during the summer because it's hot, or the afternoon storms, then sure... that makes sense because it is always hot and afternoon storms during certain times of the year... but hurricanes are a rarity, even in Florida.