go reflect is not commonly used, goroutines are pretty simple to pick up. I have used several large codebases with zero use of reflection. The point of go is it restricts you to 25 keywords (the basics that you sneer at above) so senior people can't get fancy and produce an impenetrable mess/marvel that beginners will take months to orient themselves in.

It is definitely easier to write well than js IMO, and harder to make a big ball of mud in.