Toward a "modern" Emacs

I used to use etags extensively when working with code. I recently changed to a different editor which doesn't (yet) support etags, and having missed it at all.
This editor has easy access to "git grep", so I click on a name, "Alt-dot", and up pops a list of matches, which I can select from or walk through. Sometimes finding the declaration among all the uses is tricky, but usually it is no trouble.
The result of "git grep" is always completely up-to-date!