During my 4th kyu testing, I had my first moment of aikido being truly easy. I dispatched three uke, and it felt as if I'd hardly touched them! I just stood there, slack-jawed, and they got up and started to knock me around.
Now, when I have an easy time of it, it serves to frustrate my students who haven't gotten there just yet.
It feels really cool when you finally just let go, but it's even cooler when you see someone else do it! I love seeing those lightbulbs appear over their heads!