Re: Have you actually used Aikido?
I agree completely with those who have noted that under stress we revert to what we have practiced in the body - heck, most of us who have trained any length of time have saved our asses by automatically rolling or falling correctly when we have slipped or gone off of bikes, horses, stairs, etc.
What I have to take issue with the OP is the assertion that aikido uses "fine motor skills."
Fine motor skills means the manipulation of small objects with the hands - it is embroidery, cardiac surgery, tying your shoes, watchmaking: all the things that require manual dexterity and can be done while standing still or sitting.
Aikido should never rely fine manipulation with the hand, but on whole body movement originating in in the center.