Heres a suggestion built on the suggestions above, in the Menu (pressing Y), have an option called Add to Favourites

Then as suggested, press the L Stick or something, this then comes up with the favourites menu.

Also when you select some files, and then click the Menu (Y Button), have these extra options, Move to..., Copy to...
and when one of those 2 is selected, it comes up with the list of your favourite locations. I think this method works well as most of the time people will be copying ROMS and various other files to roughly the same locations.