Conference Videos: "I’m a big fan of an “exploded presentation” blog post ... where you export all the slides as individual images and you write the spoken commentary"
Some people are more visual learners, so they appreciate a spoken presentation. But writing it down forces you to organize the material better.
I think a nice, scripted and tightly edited video presention is a wonderful way to present many topics. But that takes a lot of work and requires certain skills to pull off properly.
I agree though, that an long unedited video of an in-person conference is really difficult to watch and forces the viewer to do their own editing by fastforwarding and skiping through that long video.