Most years I have a trip to Disneyworld during Hurricane season. Most years it is a non-event, very few Hurricanes actually hit Disneyworld. The one year I was there the day after one followed I4 across the state, Disney reopened the next day as if nothing happened. There were trees down on the grounds outside the parks, but inside the parks it was fine. Most of the local towns had no power, but Disney has their own generation capacity.
During a hurricane they will restrict you to your hotel room for you safety, but that only happens if a hurricane is threatening to pass very close.
There is no planning or supplies you need to take to Disney in case of a hurricane, only a credit card with a reasonable limit, so if you get stuck for extra days you can pay for your room and food. The problem will be if they cancel your flight out, it may take several days to schedule a new flight, since 100s of other flight will also be cancelled. If they are forcasting a direct hit, the airlines will move all of their planes out of the area and it can take a few days for schedules across the country to get back to normal.
If they cancel your flight in, you probably will just postpone your vacation. In that situation, the airlines and Disney normally offer a full refund.
Dvc points are refunded if flights to Disney are cancelled due to a hurricane.
My sister was refunded her points when they were forced to evacuate Dvc at Hilton Head.,