When I visit my home in Florida, I fish at a lake that contains brackish water and I have seen several alligators in that lake. An eight foot alligator is not a "giant". I have seen gators longer than that and also many hatchlings, some that are already 1-2 feet long. I sometimes believe that the young gators are curious and usually approach me on the bank where I am fishing. I am not sure if it is being curious or wants my fish that I have caught. The young gators seem to have problems catching their own meal.
I have also driven across Alligator Alley in Florida, which is I-75 and travels west to east or vice versa. Normally, I get on at Naples and off at Fort Lauderdale. This route takes me through Everglades National Park. There are canals and ponds on both sides of the interstate and the gators will get up on the roadway from time to time, even though there is fencing that is supposed to prevent this from happening. There also has been two airliners that have gone down in the Everglades that I am aware of. One was the ValueJet crash and the other was an Eastern Airlines plane back quite a few years ago. Those are the two that I can think of off hand, but may have been more.
I remember reading about the recovery team fishing out parts of the downed ValueJet and they had to have sharpshooters with high powered rifles standing guard to keep the gators away from the workers while they were collecting the wreckage of the downed jet. I read about one worker that reached into the water where he was standing and he grabbed a hold of what he thought was a bundle of wires only to find out that when he pulled it out of the water that it was a rather large snake. That would have freaked me out.