I grew up in America, so at uni all our textbooks had both metric (meters, kilograms) AND imperial (inches, pounds), it was really confusing… What’s even harder is that safety standards and such are different in every country, so if you make a product (like a PS3) and want to sell it to different countries you need to pay lawyers and engineers to figure out what safety, and electrical, and law type stuff is different so it’s all legal, really confusing…
I think that’s got to depend on the country! Apart from the languages, anywhere in Europe is probably fairly easy to adapt to. America and Canada are tricky – in my experience they are largely just like being here and because of that, they lull you into a false sense of security. Then, some teeny-tiny little difference will come along and throw you for a loop.
I’ve never been to anywhere from a totally different background, like China, but I imagine it can be pretty tough to get up to speed there.
It’s worth remembering, though, that for the most part, wherever a person is from and whatever language they speak – they’re just people. They want to get along and make friends and have fun and laugh like everyone else. That’s got to make it easier to adjust!