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I'm with you. Photoshop is just a rapid visualization tool to make sure the concepts in my head are sane. Often they don't quite work out as I picture them, so Photoshop makes it easy to quickly iterate on alternative forms. Once I'm confident in the direction I'm going, I'll switch to actual implementation, often not even finishing what I was working on in Photoshop.

Using Photoshop to slice images up into pieces and reassemble them again in HTML is dead, but I think that process has been dead for more than a decade now. Photoshop itself is still quite useful though and many of its features map quite well to CSS.