Thank god I spent $1000 on this 30-inch monitor so Adobe could fill the screen with its atrocious interface. That's right: There's no way to keep Photoshop from hogging the entire screen! Even if you have a big monitor.
Of course Adobe doesn't tell you this when you buy the product. One of the Amazon reviews mentioned it, but I read another review elsewhere that implied this setting could be changed. Ars Technica: "the default behavior of the editing workspace is a 'maximized' view..." Uh, no, not the DEFAULT behavior. The only behavior! And the only way I know is this more honest online review.
There's also nothing in the sparse Photoshop documentation, and Barbara Brundage's "Missing Manuals" book is useless on this topic, I guess she couldn't fit in a discussion of the 2560-pixel-wide elephant in the room while gushing about how "cool" this program is.
Not that I'm bitter!
(Disclaimer: I'm bitter.)