That's why you can disable it on-demand :-)
Anyway, searching for an open file is something really hard with that one-line notebook, and searching for them among the extra-large project file is exhausting. That's why I like the files list. I can just click on it, and voila!.
Anyway I have some plans for that. For example, I want to be able to choose the icon whether the file is a source file, a form (resource), or who knows - an bitmap, maybe?