(rather than my eyes wandering around -- I'm such a visual person!) When I look through the sketchbooks later, I find myself remembering what was taught because I was more fully "in the moment".
(I add color later at home.)
Ours is a small, non-traditional church that started as a house-church. We don't sit in pews facing one direction --- we sit in a circle. So everyone can guess that I'm sketching as I write down sermon notes.