I’ve been using a pen/tablet to edit for about 7 years now. I would never, ever go back to a mouse for any computing. Creating video is an art. I consider holding the pen akin to drawing and creating the way an artist would with a canvas. It makes me feel more like an artist sketching ideas rather than a computer geek absorbed by the technology. Just a little mental game but it works for me.
The next step is to stand at my editing station rather than sit. This is a technique Hollywood editor Walter Murch uses. Laugh if you choose, but ergonomics changes the way we create and think, IMHO.
Mark