i am a relatively new poster here... didn't even know of this board when i went on our first and only disney holiday. i am *not* from alligator territory and realized abstractly there were gators in florida; there is lots of water connected so it makes sense they "get around".
i have seen videos of them but wasn't aware any have been found on disney property. from what i have seen, i would have been aware at a golf course but not really an amusement park/resort area. i assumed there was control in place, to manage them when they got too big to be around humans safely.
i admit i didn't think about it at all when i was there.... i didn't see any signs, no warnings... everyone told us not to drink the water when i got off the plane in the dominican, on the bus to the resort, at the resort when we arrived. there were signs in the public bathrooms and in our bathroom in our rooms. so we didn't drink the water.
i didn't go in or let my kids in the lake at the CR but that is because i am a rules person and when it says no swimming, we aren't going in. btw, had never heard of this brain eating amoeba either... til all this has come up.