Sketchnotes keep people engaged with your content in a whole new way. They can literally give students the big picture of each lesson or the course as a whole. Presenting information in new ways allows people to think about that information in new ways, too. And that's often when real learning takes place.
The sketchnote above was created from an audio file from one lesson of The Business Soul Sessions by Beth Kempton and Kelly Rae Roberts. They packed a lot of info into a very short talk! With the sketchnote displayed where students can look at it while listening to the file, students are much more likely to remember much more of what they just heard.