Hello.
First off, Disney did not decide to get off GMRS, the FCC changed the rules.
Since they legally could no longer operate a GMRS transmitter they could not leave the repeater up.
And, they could care less what kind of radio you talk on, as long as you cause no problems.
Be it a full sized talkie or a camcorder, yes they will confiscate it if you try to take it on a ride, and for very good reason.
The rides can take that object and turn it into a missile, injuring someone, or worse.
Same with antennas, who takes a mobile antenna and mounts it on a stick and takes that to a Disney theme park but a dufus?
No, leave the stupid stuff in your car, or better yet, at home.
You have thousands of people in a very small place with a lot of children.
I have yet go have my radio confiscated while taking it on a ride, and I also have seen plenty of people going on with camcorders might not have been a full sized VHS one, but I have been seeing people bringing them on rides, and have yet to get any flack about my radio, I'm not sure if you know but Disney does have two ham repeater on site for hams to use.