You may not use "what" you learn, but the skills you developed to help get through exams, hit deadlines, learn complicated concepts and work in groups are invaluable.
I absolutely agree. I studied economics and people have asked about it - what do you actually learn? You learn maybe a couple actual skills (regressions being the big one) but more importantly, it was learning about how to think like an economist. The sciences had more practical skills I can say I learned about data structures, theoretical performance, etc, but the biggest thing I learned taking CS courses was how to solve problems and then how to solve them faster, more efficiently, planning my time, and other skills which aren't listed in a course description.