Thank you Ann for all your insightful replies. I have learned a lot about colour management.
One thing I don't understand, though, is why you dismiss Lightroom as something aimed at the Hobbyist segment. In my opinion it works very well together with Photoshop.
When you prefer Bridge and ACR you should of course use that. However, it seems like a lot of people prefer the workflow in Lightroom. Is the quality of what can be achieved using Lightroom and PS any different than what can be achieved using Bridge, ACR and PS? Isn't it just a matter of very personal preferences regarding the layout on the screen?