OK, so you are telling me I should spend 349 US$ of my hard earned cash to buy a software not delivering the feature I was expecting most on the ground that most of my fellow photographers don't need this feature?
Just to be perfectly clear, it's Apple's fault that Photoshop CS4 won't be able to run in 64 bit on Macs...At the 2006 World Wide Developer's Conference, Apple promised to make Carbon (the APIs that Photoshop uses) available as 64 bit libraries when Leopard (10.5) was released...Adobe took Apple at thier word and planned on the development of a 64 bit version of Photoshop CS4 for the Mac using those 64 bit Carbon APIs. At the 2007 WWDC, Apple announced that they decided to kill the Carbon APIs for Leopard and developers had to switch to Cocoa in order to take advantage of 64 bit. You don't just change over 4 million lines of code to an entirely new set of APIs overnight. Apple knew full well that killing the 64 bit Carbon APIs for Leopard would mean that Adobe couldn't release a 64 bit version of Photoshop CS4 for the Mac...
So, if you wanna be pissed at somebody, it's Apple you should be pissed at.
Apple has a long track record of changing their minds and changing their platform and forcing developers to jump through incredible hoops to remain on their platform...they did it when they switched from 68K to PPC, they did it when they switch to OS X, they did it when they switch to Intel and they've done it again when the decided to kill Carbon 64 bit.
And, it's not just Adobe who gets the short end of the stick...any and all developers who develop for the Mac platform are forced through the same hoops. PixelGenius has suffered having to switch OS's and compilers as Apple has forced these changes down our throats. But compared to what Adobe is faced with, taking over 4 million lines of code (and counting) and going from using Carbon APIs to Cocoa APIs, our problems were mild. If you don't understand the implications, just realize it will be tens of thousands of man hours to do the work to get Photoshop CS5 to run under Cocoa and be able to take advantage of 64 bit libraries and APIs. Something Apple could have avoided if they had kept their promise to deliver 64 bit Carbon. But, Apple seem more concerned with advancing the iPhone (which caused a 6 month delay in the release of OS X 10.5) than with providing an optimal platform for 3rd party developers...
Compare that with MSFT and Vista and it's remarkable how much MSFT goes through hoops HELPING developers rather than hurting them.
And understand, I don't like MSFT and I am an Apple fan...I hate Windows. But, if you want to run 64 bit Photoshop CS4 on a Mac, you'll have to install Bootcamp and Vista 64 bit to do so. I can tell you from testing this (I have a MacPro with 16 gigs of ram) the pain of doing so may actually be worth it for people working on large multi-layered files.
So, just be clear whose fault the lack of 64 bit processing for Carbon apps is: Apple.