I didn't state my original point clearly enough. If you edited Cosmos to take out Dr. Sagan's lengthy and yawn-inducing monologues about our insignificance in the cosmos, you end up with The Mechanical Universe, which is paced at the speed of top-tier college lecture.
I also don't think it is a problem to match the pace of the lecture with what today's you are accustomed to. When sound was added to cinema in the early 20th century, purists claimed it would ruin the art form. The same thing happened when people actually began to edit with an artistic eye and shots reduced in time from 30-60 seconds to 5-10 (with the advent of new technology). In fact, there was even resistance to technicolor by the French auteurs!
I wouldn't be quick to claim the way I learned, or the way engineers in the 1950's (or 1850's!) learned, or the way you learned is "the one true way." If youth are accustomed to fast-paced editing, then use that form. If you personally don't like it, open a book and learn at your own pace, or launch a Kickstarter.