You don't need to be scared, you do need to be prepared for inconvenience and transportation issues.
In comparison to Irma, this definitely has the potential to be worse for the Orlando area (certainly it will for Tampa). Irma was Cat 4 on landing, but that was far SW Florida. I looked up the meteorological history and it was a weakening Cat 1 as it moved fairly quickly through the Tampa-Orlando area. This will be moving slowly and is forecast right now to be 130 mph a few miles off the coast of Tampa before weakening.
This is going to be historically bad for Tampa because of the slow moving storm and storm surge. Right now it's projected to be 10+ feet and could potentially cut St. Pete off from Tampa. That and all the evacuees will strain Orlando to recover from whatever it experiences more inland.
Again, if you have to be there, you will be safe at WDW (as long as you don't go out in the worst of it to "have a look.") But do whatever you can in advance to prepare from a supply standpoint. And if you have transportation plans to leave Thurs-Fri, that may not be happening.
For best advice, use the NHC website. They update the path and have a good written discussion every 6 hours. Nobody can forecast better than them (your local media guy just essentially takes their information). Also, another good site is Levi Cowan with
tropicaltidbits.com. He does a great daily vlog discussing a lot of the nuances that help you understand what could still change and what impacts are likely.