I would not blame Google in particular. Go team operates like they are not part of Google most of the time. You are right about the abilities of other languages to make things easier for LINQ-like scenarios. But in Go, that's as much as I could get. I don't know what else to do.

I am planning to add SelectMany, ToDictionary, GroupBy and Zip methods soon. I cannot agree you more, I also am not happy about the result I ended up with. Anyway, this was my first project in Go, I will maintain and keep adding stuff to make things easy for other people who might like to use this. But Go is 'really' not for this, I know.