Full disclosure. I googled something else, and this thread appeared in the results. Two edibles later, I decided to reply and bump it back to life.
Disney's notoriously stingy. They don't do facial recognition because they won't pay for it. And while they do have loads of cameras, they're not for the reasons you assume: they're there to stop shoplifters in the act, and for safety on attractions; but not to follow people around automatically.
With that out of the way, if they want a picture of you for their files, they will get it. I've seen Disney's BOLOs before, and in more than one, the picture used was identical to one used in a drivers license (the same crap lighting, pose, etc).