There was a 'may' in my original comment. It is metaprogramming, so you can't see every usage automatically even with "alien tech" like IDEs, unlike in case of a normal type.
Especially that we are not even talking about own code, but third-party annotations with its third-party consumers. Also, grepping is a pretty standard term, it doesn't necessarily mean literal CLI grep, but go on with your advanced tooling as if no one else would be familiar with an IDE.
