Generics will be insanely useful for me. I work in an environment that uses a huge Golang KV store for all persistence. This means we write all of our own indexing code etc. None of it is reusable because of the lack of generics, so each module has much of the same boilerplate for building second indexes, etc, often written in slightly different styles because it was written by different people.

Generics will let us build a set of tools for DB access and indexing tools which can be reused across all types.