Boy, my mom would have really LOVED having a food processor to make butter ... so would I have! I was usually the churn operator (unless I could plead a heavy homework load) and that really got heavy when the butter started to form. Then you work it in a bowl with a wooden spoon to work all the buttermilk out and to mix a little salt into it. You're right ... that's all there is to it!

There have been several people here over the years, who've asked if you can overwhip cream -- I usually tell them that yes, overwhipped is called butter!