I am an attorney in the Northeast, not Florida, just to add a few comments. Jokes about Fenway are kitsch but I'm going to let it go.
A case is unique to those parties, so it is impossible to provide a blanket "if you get COVID, this is what happens to Disney." You need to understand the underlying facts in each scenario. Separately, although waivers and consents are enforceable if they're unambiguous, that doesn't absolve the presenting party of any wrongdoing in any scenario. For example, at least in the jurisdiction I practice in, an enforceable waiver does not absolve reckless misconduct, i.e., something above negligence. So, if you waive your rights regarding potential exposure to COVID, but in the park employees are coughing on people, not wearing masks, and not cleaning surfaces, it seems possible to open the door there. Also, it's not possible to waive liability on behalf of a minor in some states, not sure if that is the case in Florida. Lastly, I'll just add the law will evolve in this area as it is new territory for the most part, and much of that jurisprudence will be informed by how companies respond to the information that is out there. I think Disney is putting itself in a good position by warning visitors, but also training staff to avoid torts that rise above what they are otherwise protected against. Of course there will be claims and settlements.
One thing I will throw out there that seems to run through forums like this - get advice from a professional. If you are injured at Disney in any scenario, talk to an attorney. If you are worried about getting sick at Disney, speak to your medical practitioner. These people give advice for a living, and that advice should factor into the formula of how you act. I see a lot of "Disney can do whatever they want, it's private property man!" I also see a lot of "I feel good about going to the parks because other bloggers/podcasters etc are going." I have no opinion on what other people do, I am just offering that you can and should speak to a professional and obtain professional advice.