I don't miss generics in Go and I have used generics in C++ a good deal. I think the whole generics argument against Go is largely parroted by people who may not even know what generics even are. C doesn't have Generics either. It's doing OK.
I'd flip what you said and say that most of the people arguing against generics in Go don't have much or any experience with them. Which makes sense because a large number of users came from dynamically typed languages.