I don't find the workflow a problem Steve, because I fairly mercilessly discard my rubbish shots which doesn' t leave me many to play with usually.
I shoot in Raw and jpeg. At moment I'm using Canons own Raw conversion software and then saving either as a Tiff or jpeg. I use PSP for the bulk of my retouching work so it's the package I'm most familiar with, and the retouching tools, (one in particular anyway) are superb. I don't have the Raw plug-in for PSP at the moment. I also have Photoshop and various other packages including Corel, but again I'm in need of Raw plug-ins for those.
White balance has never been particulary impressive with digital cameras I've used, particularly under tungsten light. Whilst the 20D is definitely better in that respect, there are huge advantages in using Raw to control WB. The images from the 20D tend to be a little soft for my tastes, so it's nice to be able deal with the sharpening too.
I'm still getting used to the 20D and it was a big decision to change over from Nikon, but one of the most impressive things about the 20D is the simplicity of the menus compared to Nikon - I find the menus very intuitive and user friendly.