I started to learn emacs in 2006 after a friend show it to me in it's no-window version in a OS X Teminal. We were at the time art students and most of us didn't have programing education. Some people were playing a bit of advanced flash or Max (proprietary Pure Data sound processing), but most of us were doing performing art, sculpture, sound or painting.
Honestly, I have been so motivated by what I discovered, that, the learning curve hasn't been so bad. The folkloric keyboard shortcuts were easy to memorize and the software never failed me. I stopped using Text Edit and the horrible .rtf format and I learned that plaintext was surely more appropriate to write poetry. And wait what is it? Markdown?
I started to open mp3s in text mode and grep into videos. It was really exciting. It was possible to open incredibly huge files in text mode, and the computer was still usable. Wait... Why common browsers slow the machine down when you try to open Gmail then?
I discovered a land of wonder full of funny animals, meaningful laws texts (I mean GNU license) and documentation to read until the end of your life.
In 2008 I ordered GNU Emacs Manual 16th edition with a tee shirt, the reference card is still on my desk.
This piece of software is usable, accessible, documented, and it is still possible to use it 30 years after it's creation. Let's be honest: what is the aim of having a fast-learning-curve if you learn tools that you won't use in 2 years. If the tool is a bit hard to learn but we'll designed, it maybe worth the effort.