Just want to make a few comments.
1) As a life-ling Orlando resident, I tend to rate storm strength based in how long my home is out of power. When Irma came up the state in '17, she was a Low 1/TS by the time she came through Orlando. I was without power for almost 5 days. Dorian is currently projected to be a 3 when it (tentatively) hits around Daytona. There's not going to be much land to break up the storm this time, so it's likely to be a 2/3 when it (likely) hits Orlando.
I will not be surprised if this isn't the strongest storm to hit out area in quite some time, certainly it will be the strongest since Charley (in which I was out of power for over 2 WEEKS and the stucco in my apartment complex was ripped right off the buildings).
2) Now is the time to seriously consider altering your vacation plans. I'm not going to tell you to cancel, but I also don't think weighing a day or two of closed parks against your total vacation length is the right way to go about it, either.
And if you don't already have a vacation planned and are thinking about booking so you can experience a hurricane at WDW (like certain bloggers did in '17), please stay at home.
3) If you're planning on coming anyway but want to stock up on supplies for your room, note I went out on my lunch break to get a few things for dinner and the grocery store was already sold out of many staples. While there's certainly time for them to restock, just note locals seem to be taking this much more seriously than prior storms, so you will be competing for diminishing supplies with people who are already here. Bring it with you or have it delivered, if possible.
4) Stay safe.