I would have a look at Picture Window Pro
http://www.dl-c.com/
Written by photographer and original programmer of Lotus 123. Introduced many feature in advance of Photoshop, and if you search through the help forums you will find comparisons between Photoshop and Picture Window from people who use both.
The only reason I can see for normal photographer to use Photoshop over Picture Window Pro is that the books and tutorials for Photoshop make it much easier to learn and appreciate what it can do.
It seems that if you produce files used directly in printing industry you need to be able to produce digital files with precisely matched colour profiles (I've forgotten what they are called), which Picture Window cannot do, but is irrellevant to all but a minority.
I now fnd that LightRoom, with a minimal amount of tweaking gives me more than satisfactory images. But in the days when I was professional photographer, I would have wanted something like Picture Window Pro, or Photoshop. Probably Photoshop, but just because it is the industry standard, not because its any better than Picture Window Pro. Indeed, I stopped using Photoshop, once I had Picture Window Pro.
Graham