There are some games I can't imagine trying to play with kb/m and getting anything like as good an experience - Psychonauts comes to mind, in particular, because there is that arrowhead collecting progress gate that is WAY easier if you have the controller vibration for your dosing rod, and the worst parts of the meat level are way easier with controller too.

But at the same time... I've had the apparently weird experience of finding platformers that "must" be played with a controller to, often, be way easier on keyboard, just because that's how I grew up playing platformers, I guess. No amount of practice has changed that for me.

Tl;dr: I support your unexpected souls game controller preference.