Occasionally I'd go from regular work (notes on a project file), to a business or client meeting (pull up notes from past meetings, update with new notes), to a volunteer meeting after work (pull up the previous week's training notes). At each point I had all the information I needed without having to juggle binders or loose-leaf papers.
And I love that I can rework my notes as I write them. So, during a meeting, first draft is just scribbling stuff down, then while people are busy listening to themselves talk, I can drag my scribbles around into priorities and tasks, add a diagram, clean a few things up. This is a completely different workflow from either plain paper or laptop/tablet, and it really works for me.