I took about 60 credits - ~8 hours per week each school semester - of Computer Science courses back in the mid 00's at a top state school. Besides the 101 Course, heavy on Java syntax; and Software Architecture where one learns the dark art of Swing, we used pencil, paper, and white boards (even a few chalk boards!) for the rest. I use concepts like Dijkstra's algorithm and the Turing machine regularly in my job. The…
We can make a good house without metal fasteners using hand tools and nothing but muscles. But that doesn't mean that a house built using brushless power tools in 1/4 the time isn't also a good house.
More directly: I conceptually understand a lot of algorithms that I read about. For me though, the ones that I learned by coding them and running them are the ones I understand much better. Hand written notes on a lecture do not guarantee complete or correct understanding, and there is no mechanism for checking.