Because often you don't know what to grep for, or search is too general and returns lots of irrelevant results, or perhaps you're just in process of onboaring o

Because often you don't know what to grep for, or search is too general and returns lots of irrelevant results, or perhaps you're just in process of onboaring on the new project and you want just to browse the code and follow different logical paths back and forth... and when dealing with the code that's well-organized and grouped into logically named files and dirs, you simply can navigate down the path and when you open a file all related code is there in one place without extra 10k lines of misc. code noise.