I'm right with you in terms of being an old school c++ programmer. I'm really fond of the QT framework and they have been doing a lot of work to port their widgets for WebAsm use. This made taking our existing Desktop GUI application and embedding it straight into a webpage super easy. Our backend servers are C++ based and speak JSON via WebSockets so reusing the same objects on the front and backend was also convenient. Also, I would imaging web assembly could open the doors for much more advanced game engines since a lot of them are written in C++.