It looks like the 'org.gnome.nautilus.preferences show-hidden-files' key is deprecated, try this instead:
gsettings set org.gtk.Settings.FileChooser show-hidden false
FWIW, what Gareth Jones posted in http://forums.fedoraforum.org/showth...36#post1673436
would work as the GUI option in Nautilus preferences controls "org.gtk.Settings.FileChooser show-hidden".
(You can open Nautilus preferences from the AppMenu, when Nautilus is open and focused look at the top panel in gnome-shell, next to "Activities" in the top-left-hand corner you'll see Nautilus icon, click it and select Preferences).