I sympathize with your point that being able to use simpler tools (such as grep) is often a good thing instead of having to rely on heavy-duty functionality (such as a full IDE/language server). That said:

- Ctrl+F in a file specifically isn't guaranteed to always return a hit with Go since a package can span multiple files, and you can have methods in other files.

- Increasingly many tools (like Sourcegraph and GitHub) make rich code navigation available on the web, without having to use an IDE or check out the code locally. Yes, it's not perfect for all languages, but it's improving every day. Similarly for documentation tools in different ecosystems -- I think both Haddock (Haskell) and rustdoc support cross-linking references to definitions.

- If you have textual code search for dependencies, you can still grep through the code with a regex like `func \(.* *?MyType\) myMethod`, and it will give you hits in other packages too.