What is the "biggest" gain a language can have is a matter of taste. Someone who considers the handling of formatting and style to be the "biggest" is likely to be one who values those things highly.

That you do not value those things as highly is not particularly profound. It doesn't mean that he is wrong to be excited about that, nor that he is excited about the wrong language, nor even that there is no reason for you to be excited about that language. It only means that there is no reason for you to be excited about that language for that particular reason.

The formatting utility is really just a side effect of the decisions to Go team made regarding syntax and semantics in the language. There's also a tool to automatically update your code if the language changes (this was important during the days of rapid churn, where your programs would break every week).

They made some very opinionated choices and have largely stuck by them. You can't have an unused variable, it just won't compile. What a pain, right? Well, if there's one thing I've learned from compiling open source code, it's that you CANNOT trust programmers to clean up their code before releasing it--just play "count the unused variable warnings" next time you compile pretty much any Linux program.

The biggest gain is coroutines which are easy to add to your application. No imports, no convoluted thread initialisation just

    go myMethod()