I grew up in South Florida and went to the Disney parks nearly every year until about the age of 20. I never saw anyone wearing the hijab. If I did, it was forgotten. That was 17 years ago. I went there last summer, they were every. I will also add, that they are the worst as far as line cutting goes. They put young teenage boys to shame.
I have annual passes and go quite often. I have seen few, if any, hijabs. As a matter of fact Disney parks does not allow anyone in the park if your face is covered.
Now, outside the parks, total different story. There are strip malls with Arabic writing and restaurants advertise Halal meat. There are areas of Kissimmee that resemble Beruit.