My own mental picture of that makes it just feel very clever, rather than magical. If you imagine that addition is easy, but division is hard, it’s pretty easy to see how you can build fast integer multiplication out of addition, and create hard to reverse operations like key exchange.

Now replace “addition” with modular multiplication, and “division” with the logarithm, and you have the trick behind DH. Swap out addition for this weird operation that involves jumping around elliptic curves, and you have the trick behind ECDH (admittedly, the fact that that jumping around thing works as a group operation is still pretty magical).

What I like about this way of thinking about it is that you can fully implement the key exchange in terms of integer addition, and the fact that it lets you pass around secrets in a world without “division oracles” seems pretty mundane.