I've also seen concentrations of gators in Okefenokee and the Everglades during times of low water. Gators and bears are similar for paddlers in my view. Common sense and healthy respect, and not surprising each other, means paddling can be done with reasonable safety. Habituated bears and gators can be dangerous, but that's not an issue in the video.
Most days I'll take gators over blackflies - I've actually lost way more blood to flies and skeeters - never lost any to a gator.