I stare at two 15" WUXGA (1920x1200) displays all day. I find the pixel density to be perfect. For me, the idea that the 24" iMac (that is 9 inches BIGGER) cannot offer me any more desktop real estate is disappointing.
I am not aware of any consumer LCD display 24" or under that has a higher resolution than 1920x1200. (although the IBM 22" T221 has DOUBLE that res!)
That is no excuse for the MBP line tough. WUXGA displays are common place with other commercial laptops.
Because 100 pixels per inch (the resolution of most current Apples,) is higher than the
average consumer wants. I do on-site computer consulting, and every day, I find a customer who has an LCD that isn't running at its native resolution. I always point it out, and show them what the native setting is. About 9 out of 10 prefer having things larger. I've seen people run 19" LCDs at 800x600. And, sadly, as no current OS properly supports resolution independence, using the existing res-booting tricks just makes for ugly or hard-to-use interfaces. (Many many many webpages look horrible when set to Windows XP's 'large' resolution setting.) Hopefully Leopard will have good resolution independence that will drive us toward higher-res displays, but even Tiger sucks at it. (Heck, you have to use third-party hacks to even enable Tiger's built-in resolution-scaling.)
(P.S. for those who don't quite understand me, I'm talking about 'pixels per inch' resolution, not 'pixels of width'.)
Yes, there are some 15" laptop displays that do 1920x1200. But those are the exception, not the rule. Heck, most 'consumer' widescreen 14" laptops are 1280 by something, and most 4:3 ratio are still 1024x768.
The other problem is that the physically larger the display, the more chance of more pixel defects. Increase the pixel density, and that defect rate goes up even faster. I have seen a few of the IBM/Viewsonic 22" quad-HD displays, and none had fewer than 4 broken pixels. (Not to mention the increased data rate needed for higher-than-1920x1200 resolutions.)