The console's that the front-desk or clerical users used every day had a steep learning curve. It was something that you would definitely not be able to walk up to and just intuit.
However, once you figured it out, there is never going to be a faster UI that you are ever going to experience in your life until we figure out direct BCI stuff.
It was funny watching the new people come on board and insist that we should change the UI to something with a mouse (probably web based). They had no idea that more immediately intuitive was actually a step backwards.
My point is that just because something has a steep learning curve, that doesn't necessarily mean that it's a bad design.