Obviously it is what gives people their biggest satisfaction which drives what they do and how they do it.
For me, post processing is a necessary evil (just not as evil as a traditional darkroom). For others, working the images with their computer is their love. I enjoy spending my time out with the subjects. Others may equally enjoy working the image on the computer.
A friend of mine creates stunning graphic images of nudes which are beyond my level of creativity or even imagination. He starts with a simple image from a PS camera. Then manipulates it beyond recognition. His love is the manipulation side and expresses his ideas through it. To him, the actual "photography" is the necessary evil
He and I are opposites in just about every respect. The world would be a boring place if it were not for differences we all bring.