I think equal parts of Photography and Photoshop before taking each shot. To me, no Photoshop, almost no photography at this point. I'm always pre-thinking of how I am going to use Photoshop before I shoot something.
Let's take this finished shot. It's a screenshot by the way and I boosted up on a curve so you can see them better. And then the raw files I took of the bottle so I could composite later on. The background was chosen by the client. You can see in #58 I was using a fill card in the shot only to light up the word Darioush better than I could in the other exposures. It's way things are done now. Yes, I could light the old way, I did that from 1982 -2001 exposing tens of thousands of sheets of 8x10 and lighting it the old fashioned ways. But then you could only do one or two of those a day. You'd spend half a day lighting one bottle, rush a sheet of film to the lab, wait an hour to see it and if it was good then you'd move onto the second shot of the day. If it wasn't then you'd light some more, rinse and repeat.
This way, you shoot an exposure quickly and easily for only a portion of what you need knowing you'll build up the shot like that.
Photoshop is nothing more or less then any other tool I need.