I have always followed the idea that in essence, everything is really quite simple. If something seems difficult, it is simply because you can't see it yet. If people make things complicated, it means either: they do not understand, or, they are trying to complicate things for no reason. Everything should be simple.
Calculus is simple ... unless you don't know algebra, analytic geometry, etc. The complex becomes simple when built on a solid broad foundation. A fine castle is not just a pile of bricks except that it is ... some piles are just a bit more orderly than others.