Go has been a game changer for me also. There is also a very good package https://github.com/spf13/cobra that can make the development of complex CLIs easier.
Go default flag package is pure garbage though. That's a fact. However, Go cross compilation makes it easy to develop multi-os CLI tools. The downside is the size of the executable, it's easy to reach the 50MB bar with Go binaries.
Yes. The default "flag" package is trash. I like the Go team a lot, and I think they did a great job with many things, but it seems to me like they just said, "meh, get something that can work, usability is not something that matters."
