In my experience it comes down a lot to what people in a project use. If almost everyone has a properly configured IDE then the code will become almost impossib

In my experience it comes down a lot to what people in a project use. If almost everyone has a properly configured IDE then the code will become almost impossible to navigate without one. If almost everyone uses emacs or vim then there is little risk that the code ends up like that. If you have an IDE it does not matter much how the code is structured as nothing is more than a single click away anyway and you barely notice when clicking if you jumped to somewhere else in the same big file or if you ended up in another file, sometimes in a far away subdirectory. Code structure becomes more obvious and important in my experience when you use a text-editor. For better or worse.