I shoot everything in RAW. After using it for 6 months, I can't imagine ever shooting in JPEG only again.
The Canon Raw processing software automatically defaults to the parameteres that the camera was set too, so if you like what you shot, you just drill them down. I use RAW mainly for the White Balance, Exposure, and Contrast settings. Because I shoot weddings, it is important that the couple's skin tones are all the same in ever photo of their album. Adjusting in Canon viewer gives me the ability to do so without losing data. If I wait till photoshop, I lose data.
I view with my clients in jpeg format, and then process only the RAW photos that they choose. I don't think it takes much more time, but the results are much better.