I am not really one to talk about this topic, as I really have no Aikido background, but I can summize my views so far.
Aikido basically is blending with your partners energy. In doing so, and to do so effectively, most everything is circular in motion. The dance like practice of aikido, has a very simplistic pattern hidden by a vibrant outer shell.
Some people accept the belief that circles and the like are a part of natures "way", and a matial art like aikido take those basic principals in nature and works them into the matial "way"
So in closing Aikido for some may help them attune to the simplistic, of spiritual side that some may just call nature.
New England Aikikai