I thought the same thing. Some people are insistent on getting there (not just here, on fb too) and I have to say I am a little surprised. It's different if the storm is hitting in the middle of your trip and you are already there. In that case, I would probably stick it out. If I was currently at Disney and scheduled to leave for home on Fri or Sat, I would try to get out before. I can't understand staying in the path of a hurricane to sit in your hotel room and wait to go home.
I think some people think it will just be a day of rain and wind and then all will be fine the next day. I don't think people realize the impact this could have and how the area could be devastated for days or weeks afterwards. Power could be out, airport shut down, roads impassable etc. I was in FL shortly after Hurricane Andrew hit Miami and I could not believe the devastation. It took months and months to get things back to semi-normal. I believe that was a Cat 5, so it was much worse, but still.
Yet I also understand the flip side. Disney trips are expensive, require tons of planning, many are booked a year in advance, fp and adr's are booked months in advance, time is taken off work etc. It's not easy to just switch to another date. So I get it that people are grasping at straws and trying to convince themselves they can get there safely and it will all be good by Saturday. I hope that is the case and that it has little impact on the area.