We replaced nasty old carpet with Wilsonart laminate flooring a couple of years ago. It's similar to Formica on Masonite. We have it in every room in the house. There is no noticeable difference between that in the bathroom (glued along the joints, but not the outside edges), and anywhere else. I have scraps that have been left out in the weather for 12 months, that snap together nicely with samples that have been kept inside - nice and dry. I don't worry about water on the floor at all now. It's very hard and scuff resistant. The marks that look like scratches turn out to be bits of the offending item scrapped off by the texture of the floor - they clean up readily, and the floor looks like new. We're very happy with the stuff. So far, it's performed better than advertised.
Laminate floor has its advantages but you cannot let water stand on it for any length of time. I would never use it in a bathroom or anywhere else likely to see a lot of water. The manufacturers will tell you it can be installed in a bathroom if you use waterproof glue and seal the entire perimeter. I would not do it unless the planks are guaranteed waterproof (a few are, but most are not).
-- OK Don, KD5NRO Norman, OK "Even if you're on the right track, you'll get run over if you just sit there." Will Rogers '90 300D, '87 300SDL, '81 240D, '78 450SLC, '97 Ply Grand Voyager