You know those vector bezier-curve tools like the "pen" tool in Photoshop? And you know how you're severely limited in how you can actually turn them into brushstrokes? I'd love it if there was an option where you can start tracing over that line and it keeps the center of the brush stroke snapped to the line so you can just sort of vaguely follow it, but you can still have total control over the quality of the stroke.
I fully admit that I'm lazy and constantly looking for more ways to make machines do all the hard work for me. But when you get right down to it, isn't that what innovation is all about?