A brief post today, but a very important one. I need to make something VERY clear:
If you shoot in Raw format, and edit in ACR or LR, you should never need to do any overall adjustments in Photoshop. Your overall editing (the whole photo, I mean) can and should be done completely in your Raw program. If you do any global adjustment in PS (even a small thing like a soft light layer, or a little curves bump), then you haven't used your Raw program efficiently, and you've wasted some of your valuable time.
Photoshop is for selective work - ie layers and masks. Lightening somebody's face, or greening up some grass, or whatever. Also, the pixel editing such as cloning, healing, skin smoothing.
If you find yourself having to make overall adjustments in PS, stop and slap yourself, and re-visit your Raw processing. Time is money, and you should be working as quickly and efficiently as you can. And that means harnessing the amazing batch-processing power of Raw programs.
There is, of course, one reason to make overall adjustments to your photos in Photoshop, and that's for artistic effects. Only apply your creative stuff right at the end of your workflow, once the clean processing has been done.