@cwilbur the designer will design the website in Photoshop and then hand it over to a developer who slices the Photoshop document up and codes the HTML and CSS to support it.
I have no idea what happens in your world, but it doesn’t happen in any professional studio that I have ever seen. If I turn my head a little to the left I am looking at one of the top studios in this part of the country – we win numerous design awards every year, mostly Gold and Silver, and have done for a little over seventeen years.
Why do you think that Adobe developed an integrated design suite? All Art Directors in any studio that I have ever been involved in would find that approach amusing – for a moment or two. Why use the wrong tool? Dreamweaver with simple CSS, Fireworks and Liveview is for WEB development, Illustrator is for artwork and Photoshop is for image manipulation, nothing more.
I am more concerned with print media and use Photoshop, Illustrator and InDesign daily but as more than a third of our print publications are seconded to the web we have a full studio for that single purpose. None of our graphic artists and designers use Photoshop for anything other than its intended purpose – why would they?
Possibly if someone only had Photoshop and not the full suite I could see them trying to use it in the way that you suggest – but not in a professional environment.