I think hydration via ingestion and hydration via humidity are both essential to the shedding process and the overall health of the animal.
I don't think using a fogger is a bad idea or anything, its just not practical for most people. I don't think it does anything more helpful than a spray bottle would. They are both increasing humidity. I use a spray bottle, or just a big water bowl. I use tubs so I don't really have any shed issues.