With so much note taking apps nowadays, I can't understand why does anyone still write notes with pen and paper. You need to bring the notepad, book or that paper to retrieve that information, and most of the time you don't have it in hand. While my phone almost always reachable and you carry when you go out. For those still like to do handwriting, there's many app does that and they can even convert it to text notes.
So, if you still write notes with pen and paper, why?
I used to have my shopping list on my phone. Replaced that by a whiteboard on the fridge, which is much less cumbersome to use (seriously, typing on a phone nowadays is almost worse than back in the T9 days). Before I go shopping, I just snap a picture with my phone.