I think these two rightfully get highlighted, but I've found it difficult to organize complex Go code (though clearly some people manage), which I think is now my biggest issue with the language.

It's inability to deal with cyclic references, the lack of overloading, the lack of package-level visibility and the lack of static functions all contribute to a lot of ceremony.

You end up with functions like newUserWithPassword and NewRole (casing intentional), instead of User::new() and Role::new()

You could just have a NewUser that takes a NewUserOpts which exposes a fluent interface. But again, a lot of ceremony.

You can use a package per type, but still no overloading, and you'll need a 3rd package to bridge the two if the reference each other.