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> It's OK to repeat the same 3 lines of code

… 2–3 times. Not ok to repeat them 1000 times.

No, Go repeats the same 3 lines of code millions of times that you should never really have to do. There is no reason you should have to constantly throw in err != nil boilerplate when other languages have Optionals that make this automatic (and typechecked too). Likewise with for loops that could be done much more simply with proper maps and reduces.

OTOH, when you're repeating the same 3 lines of code over and over, refactor so it can fit in one line of code. This is one of my big peeves with Go; in C at least I can make a RETURN_ERR macro.