I've only been printing again about a year, but I agree with what others said about printing... that's where I've learned the most about developing film. All the changes I've made in exposure and development have had specific aims in terms of printing. I am using mostly 2 films, Tri-X and FP4+, and I like them both very much and have learned a lot about both. Whether that has slowed me down vs. sticking to only one I can't say since that's not what I'm doing, but I'm having a lot of fun and like having a choice. Actually... now that I think about it, it IS slowing me down because my progress with each film is slower than if I only was using one. That's okay though, there are many times I'm just out walking and Tri-X is a lot easier handheld.