The poll question is a little frustrating
From where I stand, the answer to the poll question is "yes and no."
Yes, there are things you can do by yourself that help your aikido. I spend time working on bokken and jo cuts and strikes. 1000 cuts is not something that you do with a partner either. Taisabaki are very useful for getting a feel for good body movements. I also often go through techniques without a partner so I can concentrate on footwork and posture.
However, all of these things are meant to supplement practice with partners. After all, working with another person is the heart of Aikido.
My two cents,