Well obviously we use the "Reported posts go to a private forum" (have you clicked install on it btw

)
We also have a Junk forum for all removed threads (With a 'Move to Junk' option in the thread tools).
We've never found the need for hidden posts.
We also have a mods forum and an admin forum.
Oh, and the forum has about 12 staff atm, with some responsible for different things (so I do server admin, vb and vb mods).