I kind of get the impression that a few people missed/ignored this bit from the OP:

That, in essence, shouldn’t be so satisfying..

Well in that case, this special kind of frozen mud- not as boggy as normal mud and offers a satisfying crunch as you pass over it.
I’m strange like that 😉

Nailing the apex of a corner whilst walking.

And that 😆

Good! I thought it was only me who was still that childish 🙂

Lining up the ruler perfectly against the crop marks on artwork, then running a scalpel down it.

Really oddly satisfying, that, no idea why. Sadly, I no longer have the opportunity to do it. 🙁