I've visited Germany, Holland and France a bit over the years and pretty much only encountered toilet paper there as well. I'm assuming this is representative for most households in the countries.
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Spain – is a bit of a mix. In most cities and beach resorts you can flush the paper. Although you might be asked specifically to use a bin, in which case, do. If you're out in the countryside and stuck in a refugio bury it or burn it.
France, Portugal, Italy, Japan, Argentina, Venezuela, and Spain all use bidets, they'll often have toilet paper available in public spaces for tourists, but homes would all have bidets installed. Japan is the one Asian stand-out in that they adopted bidets rather than other ways of washing the bum.
If you'd like to say “the bathroom” in Spanish, you would generally say “el baño” or, perhaps less often, “el servicio.” Of course, it all depends on the country in which you find yourself. A few of the many synonyms include: el wáter, el retrete, la letrina, el urinario, el lavavo, and more.