I'm a serious C++ programmer, and I'm also in the Rust boat, rather than the Go boat. I've tried Go. More than once. And each time, I feel really restricted. I feel like I have to solve problems a certain way, rather than the way that fits the problem. With C++, I have multiple approaches to solve a problem, and can choose the one that offers the best trade off of performance and maintainability.

For now, if I'm really wanting concurrency, and don't feel like C++ is doing what I need, I'll grab Java/Scala with Akka. They allow me to create a solution tailored to a problem, rather than tailoring a problem to a solution.