Yes - when we lived in Port Moresby in the 1950s we cared for some new born crocs in our bathtub for a few days until they were collected by a specialist - I think they were taken to a croc farm. They were cute but feisty.
Yes, I went swimming in a pool where there was a freshwater crocodile I didn't see when I got in because it was lying very still. It was a fairly small one (maybe one and a half meters long) and all it wanted to do was lie on the edge in the sun but it still gave me a start.
I certainly have but it's in a crocodile farm and the crocodile was in its makeshift water lily-filled swamp habitat, surrounded by a large screen, barbed wires and tin roofing. I can see the crocs through the screen and the biggest of them all - a 23-feet scaled giant - was peering through the surface of the swamp, half of its body submerged. Its mouth just a yard or so from where we stand behind the screen and barbed wires.
Only on a boat river tour in the N.T, then on another boat tour in Costa Rica.where 1 of the guys from the boat tour, pulled the boat into the shore, then walked into the water with a stick, hitting the water with it, (not the croc) to bring 'his' croc closer to the shore, so he can feed it! He's been doing this every day for many, many years. None of the other boat tours were allowed near our boat. He's the only person from the tour's who's allowed to do this!