well i am absolutely certain that i would be a better programmer if, more often, i would excercise the discipline to shut off my Mac and get a pencil and paper instead.
Another fan of the pencil-and-paper approach to learning computer science, the great Edsger Dijkstra, whom i don't believe ever served time in prison. This well-known preference of his was not of course an exclusive preference, rather he just believed that problem solving should begin with more basic tools of cognition before moving to the computer, to wit:
Computer science is no more about computers than astronomy is about
Given the era in which he lived and worked (early 1950's until his death in 2002), clearly he didn't have ad libitum access to a computer for at least the first couple of decades of his professional career. Yet from the early 1990's until his death, he had a desktop Mac in his office at the University of Texas, though apparently he used it only to surf the web and check his email--for hard core hacking, Prof. Dijkstra continued to use a fountain pen.
Keep in mind that this conviction wasn't that of an academic mathematician, rather Dijkstra was in fact a programmer. That's certainly how he saw himself--e.g., his acceptance speech for the 1972 Turing Award was titled, The Humble Programmer, likewise, his first job came with the title "programmer", which apparently made him the first one ever in the Netherlands. When he listed this title on his marriage license application five years later, the authorities rejected his application because of that--no such profession, according to the Dutch authorities.