The last time I was setting up a system, it's still very difficult to find in the menus. If it's not discoverable and I have to know the incantation/shortcut to do it, then that's bad UI.

Is that permanent across reboots and all? I think that was the main issue I had with it, but was a long time ago now.

There is a checkbox for file extensions and a View menu item for full paths. Hidden files is still not surfaced in the GUI, but is persistent.