I'm pretty sure C++ is used for exactly the game thing Go is used for. And C++ is used for a lot of other things as well. In fact, you will probably have trouble finding a problem that wasn't solved by C++ by somebody. Scientific computing, server process, CRUD applications, embedded applications, AI, graphics, programming languages, libraries, etc.
C++ has a lot more features and therefore it's actually able to be used for a lot more things. People that don't need a language that can be used for every possible computing problem think that maybe C++ is a tad too complicated. Those people certainly have a point.