I'm similar to the poster you were replying to. I think there are two big reasons I use paper. 1) is that I can very quickly format.my notes however I want, draw diagrams and pictures quickly, there's just no restrictions as opposed to using a text editor or notetaking program. 2) is that when I write things by hand I tend to remember them better, and have an easier time understanding concepts when I sketch them out by hand. I really wish I could replace paper with a suitable program, but so far I haven't found it.