Answer by Matthew Spencer:
On a practical basis, it makes travel and expat life a lot easier. Of course, not everyone can speak the language. But in Europe, it’s rare to meet people without at least some knowledge of English. Running errands, speaking with colleagues, dealing with bureaucracy, all of those things come easier.
As for its worldwide adoption, I don’t feel any particular pride in that. Nowadays, English is often used outside of any specific Anglo-American context. Poles talking to Hungarians, Italians talking to Chinese, that kind of thing. It has little to do with any kind of broad acceptance of American or British culture.
There are downsides to global English adoption. The hardest for me is that I love learning other languages and would prefer the opportunity to speak them over a German, Swede, or Korean, for example, switching to English.
Lack of English can make for a more rich traveling experience. French and Italians have a reputation for cultural chauvinism, but I enjoy how many of them are reluctant to converse in English. They usually appreciate my trying to speak their language and it gives positive reinforcement for learning it.