Lots of scrappers say they really don't think they would use Photoshop much. I guess if you're a good photographer in the first place, you might not -- but I don't take a great photo (well, maybe once or twice by sheer accident) and my photos need as much help as they can get.
Have a look at this before and after. (I snagged this photo from my mum but I have one almost identical - taken in the rainforest so the light was quite dim)
I used various tricks (with layers and blending modes) to jazz up the photo, and then added fairy lights to the lamps. Better?