I've never been to Australia - but I know about giant snakes as well as other poisonous snakes, giant spiders, spiders that take over entire towns with their webs and how they migrate on a breeze, about poisonous sea snakes, sharks, sting rays, jelly fish, dingos, kangaroos, koala bears, etc. etc.
University of Florida's football team is called The Gators, for someone to say they never associated gators with Florida is mind-blowing.
There are gators on golf courses, just last week a giant gator was on a Palmetto golf course that was all over the news. There are gators in ponds, ditches, on the side of the roads in some areas like "Alligator Alley" which is what the portion of I-75 has been nicknamed for decades, which cuts through the Everglades, there are gators around Paynes Prairie (22,000 acres of land) which are sometimes seen from the road up near Gainesville. There are definitely gators (and snakes, and all manner of Florida wildlife) on Disney's 27,000 acres of land. To think Disney can get rid of all the gators is like thinking they can get rid of all the mosquitos. Google "Florida" and "Alligators" you will see photos of alligators in pools, at people's doors, in neighborhoods, gators can even climb fences.
Tell your friends that if there is water, there can be gators and snakes. That is their habitat it doesn't have to be a swamp, even if it is a retention pond, ditch, man made lake, cold spring, shopping plaza retention pond, back yard fish pond, etc. We also have black widows and brown recluses, so don't stick your hands into wood piles, tree trunks, be careful in your yards, or be careful if cleaning out your garage or attic.
The lake activities, boat rentals, skiing, take place during day time hours and stop at 5 pm, there is more activity in the lake during the day time hours, although boats run all during the night to ferry people from MK to the resorts. People should not enter the lake water at all. In the future their signs should have at least a pictograph of an alligator, snake, as well as something to indicate the water quality is not safe, amoebas, and bacteria. I honestly wonder if people will still disregard an alligator sign in the future, some people just don't care.
If you want to stick your feet in something, stick it in the beautiful pools or spas that Disney has created for the guests enjoyment, not the nasty disgusting pond scummy swamp water.