How to view Root directory and subdirectories in Finder? Apparently, the Macintosh HD icon on the desktop points to the root directory but it is not showing all the contents. 

Some of the files and directories are the same as those which I see when I perform an ls on / dir in Terminal, but most other directories like /usr, /bin, etc are not visible.

I'm assuming that for security, Mac OS X isn't showing the rest of the files and directories. Is there a way to change this behavior so as to make it like we view root folder in Linux? 

Edit:
just found the following here:


  The Finder and the Terminal show different contents for the root
  directory. Some items in the root directory are not visible in the
  Finder. This reduces visual clutter and enhances simplicity. If you
  are familiar with a UNIX-style command line you can use Terminal to
  view all items in a directory.


As per this note, Terminal has to be used to view all the items. So, what do others do? Use terminal or there is some other way?
Shift-Command-G in Finder brings up a "Go to folder" dialog. Type in the name of the directory, for example, /usr/local. Finder will show the directory. I use this with Finder in 'View as Columns'

While this doesn't give a browsable directory from the root directory down, I've found it quite useful.