I did take a music theory class a few years ago at the community college...it would have done me more good if I could have practiced an instrument while going through it, but I learned a LOT about what makes or doesn't make music work. Not just terms, which are important for me to learn more, but actual real things that you can hear in real music.
It has helped me broaden the styles that I listen to as well...been really enlightening.
The reason that I'm hopeful for the improvisation stuff is that when I let my brain just brain and I don't have any distractions, I hear music. But the music that I hear isn't music that I've heard, as far as I know, so I'm quite eager to explore that whole thing.
Didn't really think about whether my fingers will do what they're told, but I guess if I have problems with that I'll become a DJ.