You might have 1000 songs or videos but you are supposed to browse them with your media player.
You might have 1000 images but you are supposed to browse them with your image viewer.
You might have 1000 files inside a single folder that are not songs, videos or images... what are they?
Do you really have that?
Going through 1000 files (and perhaps only 100 too) is going to be an unpleasant experience no matter how much real estate you have for that.
Regular desktops are minimizing the relevance of the file manager accessing the files you want from applications or global searches. I'd say file managers are even less relevant in mobile devices.
Do you think Maemo users start opening the File Manager to find something? What?