I take it everywhere, I don't baby it. I do try to be careful though.
Bathroom. Kitchen and cooking, I use it to follow a recipe or watch a movie.
I have also taken it into anatomy lab with cadavers.
I try to be careful, but don't follow some of the crazy people on here who won't have liquids within 10 feet of their laptop. On a plane the 15" takes up the whole tray, so one of the sides of the open MBP becomes a drink holder, other is for food. If I spill it, its my fault.
I like to have it on in the shower as well for music. I have the older white remote in the shower to control it.