I take a few features from C++ in my C++/SDL2 Ultima spinoff project -- never completed sadly. Class, std::function, std::unordered_map, std::string, std::unique_ptr<type> are the only ones that I could recall.

I can't imagine reading other people's code though, unless it's in a similar style. I did find that the most difficult part is to get past the programming patterns (such as Visitor pattern) as I don't write large programs professionally.

I wish C++ stopped at C++/11. The committee seems to want to include everything into it at the moment. Maybe C++ is sort of ULTRA programming language that supports every niche programming style.