Every few months I run workshops for photographers who would like to get more out of their images by knowing how to use Photoshop better. I LOVE to teach and I always get fantastic feedback from my classes. It's a joy to hear people say they suddenly 'get it' after a workshop or that although they've been using Photoshop for years they hadn't realised the same work could be done in half the time.
In my workshops I also try and give any photography pointers I can by looking at their images and giving suggestions about better use of light or settings. Any way to make an image better in camera is going to cut down on editing time so it's always worthwhile to learn as much as you can to achieve that. I've found that video tutorials help people to learn quickly as they can watch and follow along so I add a video tutorial wherever I can.