Whilst I wouldn't claim that knowledge of film processing could make a bad picture good, I do think that knowledge can enhance the results when the photographer has "a good eye". Some folks I meet these days genuinely have no knowledge of what an "f-stop" actually is, never mind what ISO does. I think this is one of the problems of shooting exclusively in digital, it's as though shooting digitally is the "theory" class, whereas with film it's the "practical" class. Practical is always the better lesson, imo.
I'm currently doing a 12-week Photoshop night class and I think when it's finished I might just enroll in a darkroom class, even though I already have some experience in the darkroom already. Just some thoughts.
Various lenses, SB800 & Manfrotto 190 with 460MG head