The purpose of that comment is to note precisely the same thing applying to adjunctions as you note applying to monads: programmers use adjunctions all the time

The purpose of that comment is to note precisely the same thing applying to adjunctions as you note applying to monads: programmers use adjunctions all the time even if they don't realize it. "I've never heard of them so I'm assuming that's not the case"? Well, hey, most programmers have never heard about monads either. Explicitly having heard of a thing is, by definition, not a requirement for it to be something which one "use[s]... all the time (even if they don't realize it...)". [I'm not saying everyone needs to go out and learn about adjunctions. But they're in exactly the same area as monads in terms of their applicability as a concept to programming. It's weird to consider the one a down-to-earth, comes-up-all-the-time notion and the other some airy-fairy academic construct.]