Even if it's not official the IntelliJ Go plugin is quite good. It recently added support for a debugger, and it has a lot of static analysis capabilities and refactoring. I would say it is on par with other environments for most serious languages. The Emacs go-mode and vim-go are good enough but not as great.

There is a general attitude in the Go community eschewing all sorts of complexity be it in the language itself or tooling and this attitude is toxic and stupid. It will prevent Go from becoming a serious language unless this nonsense about "simplicity" is left to perpetuate. There is nothing wrong with keeping a language elegant--cue a brouhaha about generics in 1... 2... 3...---but forcing this attitude to tooling is not a wise thing to do. A significant majority of professional devs do not write their code in vim without syntax highlighting, which is what some eminent members of the Go community seem to be in favour of. They need auto-completion, refactoring (which search and replace isn't), automated deployment and testing, debugging and project support.