(Droid X here)
Yeah, there need to be a way of cleaning hiding stuff that doesn't change directories etc. When I look at my gallery, I want to show what I want. I don't want to see and sort through a thousand thumbails etc for Facebook friends, Contacts, Album Art, application jpgs, etc etc.
But, I don't want to encrypt or alter the filename as then the apps can't use them.
Seems simple enough.

HTC sounds like they have it right.