I've been using photoshop professionally for several years now. I work with photoshop nearly every day for retouching, photography and graphic design. I now do all my own "darkroom" work in photoshop, taking a scan of the original negative and cleaning and adjusting the image ready for a digital print to be made.
I also use photoshop for restoring archive prints for the British Empire & Commonwealth Museum’s photo archive.
This image of ‘Echo and the Bunneymen’ taken by Phil Nicholls had suffered from acid caused by adhesive labels in storage.
I took a high resolution scan of the original negative and removed the damage in Photoshop. I also made tonal adjustments and applied a colour tone to produce a final image ready for printing.
I use a Canon EOS film based camera for most of my own photography and now do all my darkroom work in Photoshop. I take high resolution scans of the negatives and use adjustment layers to apply localised dodging and burning.