John, a slippery slope. Scanning in combination with photoshop could suggest the type of modifications needed in the darkroom. But I'm finding that contact sheets are actually a quicker means of determining a good negative as well as giving me necessary info (eg, exposure time) for creating a working print.
Also, scanning can give mis-leading information. I recently scanned some 35mm negatives from a vacation & was horrified that the highlights seemed blown-out. I then contacted printed them, & printed the very ones that appeared blown-out with no problem. If you're doing darkroom printing, contact sheets is still the best way to judge your negatives.