I seriously doubt the ability of vertical rotation is of any importance, at least I can't think of any real uses for it. Yeah, but I can't think of one doesn't mean others can't think of one, so I guess this is personal preference. I know a couple of Eizo LCDs support the roate function, and the only usage I see others doing is reading PDFs or portrait photos.
In addition to the lack of input choices, the Apple CinemaDisplay still lacks one thing: an OSD. Actually it does come with one, just that the controls are integrated into the Mac OS so it is completely useless in a Windows environment. Of course, only the real serious graphical designers or realists alike would care for this omission. Most people I know who use Apple LCDs on PCs couldn't care less about adjusting the display. The default settings looks excellent to most.