For memorizing stuff, I use pen and lighting markers. This works quite well, and they are easy; I can quickly memorize things that way.

However had, for anything else I use the computer, and I style everything the way I need via HTML+CSS for the most part. I don't use HTML directly but a simpler and easier to use template, which is programmable (via ruby). There I also make use of javascript and have a multitude of effects to use. I can use the browser to research past content I stored and it is visually pleasing. And it takes not as long as handwriting either. So while I do use pen and paper still and probably will for the rest of my life, I am mostly in the digital era myself. I don't understand why I'd want to use pen and paper. Granted, I have to archive a lot of things, but I use various USB sticks and USB-connectable harddiscs; these don't take that much space away, compared to pen and paper written stuff or other hardcopy books. I don't think I will go back to the only-pen and only-paper, ever. I am not saying digital-only has only benefits, but if I compare all advantages and disadvantages then the digital lifestyle has more benefits. For instance, I don't need to store hardcopy books anymore (I still have them, I still use them, I still like them, but whenever I am about to purchase anything anew, I ask myself whether I want to have physical space be occupied by a book. Often the answer is no, if I can just use a .pdf instead.)