That's a good explanation.
Using the same car shock absorber analogy, you have to remember that you're not as heavy as a car nor will your legs react as fast as a shock absorber. So, when your board starts riding up a bump, you must be somewhat more proactive in "pulling" your leg up and ,when going into the gully, more proactive in "pushing" down. It becomes second nature and the sensation is probably best described as "relaxed legs". Dropping your centre of gravity by taking a lower stance is good in that it makes it harder to lose your balance, but it isn't a substitute for working your legs.
The goal is to keep your centre of mass as "vertically quiet" as possible despite the changes in terrain under your feet.