Perhaps 5% to 25%. The least would be on photojournalism, large events, and public relations work. Getting the shot is the most important factor.
Most would be on portraiture and commercial work where fine details and colour/tone are extremely important.

My approach is to use the software that will do the job the quickest and still provide quality results. Paint Shop Pro for example has a one click fix which Popular Photography compared with multiple steps to make the same fix in Photoshop. They found that the Pro Shop Pro fix was often more accurate than Photoshop. It does not always give me what I want, but even if it does on an irregular basis, it still saves me time.

Viveza as a plug-in is the fastest approach for dealing with lighting, shadows, hue and colour, so this approach is perfect for scenics. Software filters are also a fast approach to accomplishing the same task that would require several steps in Photoshop. Saturation by the way is not really necessary when you can use other methods to get similar results.

The software that came with the camera you are using or even another camera may have some neat features that speed up some aspect of postprocessing too. Photoshop is also useful and I certainly use it for more sophisticated demands.

Tegan