To preface this, I'm a mid-20s guy who grew up with a keyboard in his hands. I type absurdly faster than I write, with handwriting harder to read than a doctor's, and the idea of carrying an honest to goodness piece of paper and pen around with me seemed archaic.
Then I started my most recent job, and was provided with a Surface Pro.
I'm already well embedded in the Microsoft ecosystem, and I used OneNote before, but the workflow was a minor assistance to me, and I didn't get what the big deal was. You stuck some notes in a notepad, and then you could look at them later. So what? How does this help me?
Now, though, I've got a pen. I take my surface with me to each and every meeting I go to, and it's made a world of difference to how meetings work for me. I can take notes that have more contextually appropriate information than just text, because I can scribble out a diagram of a process as it's being explained to me. If I'm leading a meeting, I'll project from my Surface and use it to whiteboard out ideas onto the projector (like a ghetto version of the Surface Hub). I'll note other people's contributions into the same document and then share out a fully editable version of that document into a team notebook.
All of these interactions feel more "natural" than the action I'm most accustomed to, which is typing, and the end result is somehow more human-friendly (despite how horrifying my handwriting is) than my previous "list of things discussed and some dot points" method of taking notes.
If the future of interaction is pen, it'll come less of a surprise to me now than it would have five years ago.