You can't replicate everything in photoshop. I do architectural photography as a career and I find digital just doesn't stand up as well to a full frame shot composed and shifted correctly. Even with a 5DmkII and larger sensors, correcting a file for distortion forces you to crop heavily. Maybe for web that is ok, but for printing I lose the benefit of a large sensor. I use large sensors so I start with a large file size for printing. It also makes extra work later. I can compose a correct image on location much faster than it takes me to sit and adjust lines until they are straight. It is a waste of time when the longer I spend on a shoot devalues the amount I've made in that time frame.
I have comparison shots of the Leica and the 5DmkII on the same exact subject with the same final view. Leica just tilted and adjusted later, and the 5DII with a new 24-TSeII. The images look identical for the most part, but the canon file is way larger. If you are going for look alone, yeah digital works.
However, you cannot shoot right into a mirror and not see your own reflection without a shifted lens. No fixing that in photoshop!