What I do in such a situation is cmd+shift+f and do a project wide search (I leave that as the default in the "Where" field. You can tweak case sensitivity, who

What I do in such a situation is cmd+shift+f and do a project wide search (I leave that as the default in the "Where" field. You can tweak case sensitivity, whole word, or even just use a regex. It opens a new tab with your search results, and you can double click on a result to be taken to that place in that file. It's admittedly not as slick as what you're asking, but it serves me well enough in exploring a codebase.