Yes Dave, you are right that getting exposure correct in camera is important, but sometimes post-processing can give a hand. It is, after all, such an integral part of photography for most people now. The problem for me lies in the sensors in crop cameras which while they have come a long way, they still give more noise than I would like in the shadow areas. This is a problem when the subject of the photo is in these darker tones. For Canon (not sure about Nikon) overexposing these shadow areas results in lower noise when the exposure is corrected back in post. (It is vital that the highlights are not blown). I don't use this technique all the time, but for certain subjects it helps.