You know how much they could do back in the "film" day? ---- you can adjust exposure, filtering, cropping... Photoshop-ing is just like developing films - the proccess and techniques are different, but the basic concepts are the same, except that we can do more ----- we can make more artistic choices! There is absolutely NO shame to photoshop-ing, unless you think there is. (wait... does this sentence make sense?)
Photography has advanced to a digital era. Altough few still prefer the grains in films, most of us use digital. It is the same with audio recording. Who still uses a tape recorder? It is interesting to compare the evolution of tape-digital recording versus the evolution of film-digital photography (maybe I will write about that later).
Photoshop-ing or film developing are both layouts of interpretations, just like we performers, music critics, listeners... An artistic end-product is filtered through many layers of interpretations, and that's what gives life to art ----- the communication, the expression... Art is not art if it is not interpreted by a human (argue with me that a cat composes music).
Okay... I really need to continue on reading the materials for my summer class.