My biggest annoyance is that the Go language is full of implicit conventions/behaviors:

  - interface implementation is implicit
  - "export" is based on the function/type/member name (first letter uppercase)
  - private functions/types/members are private within a package not a single file
  - ...

This is painful because when you read a single file, you need to know about the rest of the code. This makes it very hard to get started with a new codebase, especially a huge codebase.

The other annoyances I have are just petty, like "if err != nil", zero-values, or the fact that VS Code still does not support Go projects in subdirectories (I like to open my whole "devel" folder).