With that said, to change Nautilus to a navigation method, which means when you click on a directory that directory is opened in the same window, isn't too hard:
Using GConf (Fedora -> System Tools -> Configuration Editor) and go to the /apps/nautilus/preferences key. You can then apply a tick alongside the always_use_browser key. Log out of GNOME, and upon re-logging in, your new changes would take effect.
The above was shamelessly copied from http://www.bytebot.net/geekdocs/spatial-nautilus.html but I put it here in case that page ever goes away. Go to the link and read the whole page, including the link to the dicussion about why Gnome moved toward the 'spatial' view. It's a good explanation, even if I still prefer the navigation approach. But that's just me.