(no subject)
One argument for it: you can select a particular window with the keyboard alone. But you still need to hunt around quite a bit. And anyway, if you have full keyboard access turned on (which seems to be the Panther-install default), you can do the same thing by focusing on the Dock (Control-D (actually I use Shift-command-D... yay for customizable bindings)), arrow-keying to the right icon, up-arrowing to the right window name, and voilá.
OK, I thought of something: if you are a graphic artist Exposé can be more useful than deciding from the Dock menu which "Untitled N" window is the one you want. But I work primarily with text, and hence all my windows, when shrunk down to shrinky-dink size, become the same sort of white rectangles with gray smudges. That's fine, then.
Re: somewhat
It seems a strange choice for Apple, because control-D, beyond being a common keystroke for shell users, has been a built-in feature of the standard Cocoa text-editing interface since point-oh. Undocumented, but certainly no secret either. Shrug...
Something nice: If you don't have Quickdraw Turbo Express Hyper Edition (or whatever it's called; you can tell I've kinda slipped out of the Mac loop) then the user-switching doesn't bother with the cube-rotation animation; it just snaps from one to the other.
Re: somewhat