[AmberV]

"Heavy use" would be going a bit far. As with Finder, Cmd-Opt-I will open up a palettised info window instead of a standard info window---and there are a few scattered preferences in palettes. You don't really use them that much on a daily basis, though, unless you are prone to constantly fiddling with your colour scheme.

Drawers and panels on the other hand, ha! East, south, and west all have drawers, in addition there are two pane style interior panels. For the record, in terms of interface I prefer interior panes. Drawers look ugly, to me, and palettes annoy me as they are too difficult to close (Cmd-W acts unpredictably, and the buttons are too small), and do not behave themselves when it comes to stacking. Always-on-top is rarely useful to me.