Implementing a 3D vector or quaternion library in Go feels like a really bad fit, mainly due to the lack of operator overloading (which can easily be abused, like >> in C++). But it is an example of a field where Go allows programmer to express their ideas in a less direct way.

I think Go is great, but I don't think describing parts of it as less expressive than some other languages is banal.

Expressiveness has a sweet spot, though. Too many keywords and constructs makes a language harder to learn, and makes it too easy for developers to build their own little weird worlds that discourages team work and lowers readability.