Effortless, no; however, some of it is sufficiently familiar by now that I don't think there is additional value in rehearsing the same material. (Example: I first encountered derivatives on Khan Academy, before they officially taught them to us; then in 11th grade as an intro to calculus; then on several tests and exams; then in freshman year of college. I don't think I need to be given the intuition on derivatives one more time, and if I took a test in derivatives I'd ace it without much effort.) I'm not expecting new notions to be very easy to learn -- moderately challenging and definitely not impossible, but not easy.