Maybe this is already broadly known, but I just discovered it and it made my life sooo much easier: Pressing Cmd-Shift-. toggles visibility of hidden files in finder. Press it once and your hidden files are visible, press it again and they go away. I have no idea how long this has existed but it is so much nicer than going to terminal and writing to the system defaults, or some of these Automator hacks. Actually, can someone confirm this is an OS feature and that I'm not activating an Automator script I've left laying around somewhere on my system?