I have no idea what you have in mind with using all those modules, but in terms of scanning a directory tree, you might want to look at a script I posted at the Monastery a few years ago: Get useful info about a directory tree.

On the whole, it's probably a bit off-track (and overkill) for what you want to do (it's a reporting script, with lots of options for what to report), but it covers all the basics, and it's works about as fast as any approach possible in perl. (I use that script almost every day.)