It was a somewhat special time, where you had a lot of relatively well-paid capable people stuck on a boat with nothing to do for sometimes weeks on end. Encourages some creativity, I suppose (: Scrimshaw is another product of that time — some really intricate stuff out there (eg: [1]).
For me, I feel like the bowline and trucker's hitch give you huge bang for the buck. Memorize those, and you can handle many things, with a bit of rope.
[1] https://modelshipworld.com/topic/27614-prisoner-of-war-bone-...