In every country there will be some expat bubble which can get away with not learning the local language(s). Sometimes that bubble will be bigger and sometimes smaller, but it definitely exists in Germany too (mostly in Berlin).

That said, I simply don't understand the mindset of people who move somewhere for an extended period of time and don't bother to learn the language. It locks you out of a lot of opportunities and makes you dependent on other people (especially for official/administrative/legal purposes). It also simply doesn't work in many places - (younger) Germans may speak decent English, but try going to Spain, Italy, or even Japan and see how far you get if you insist on speaking only English.