To be honest, something like this is useful if Nokia gave us a PIM on here (not complaining, I don't use any sort of PIM at all) because PC Suite is mainly about synchronisation.

Also it's for file browsing. I find USB Mass Storage much more useful for browsing memory cards and the internal memory (if you can even find some way of successfully dismounting with it still responding after the disconnection from a computer) would never work under windows due to it being jffs2 (under Linux, it probably would but PC Suite isn't made for Linux).
Then again saying that, the "PC Suite", could implement some sort of "wrapper".