It's not a habit but when I think 30 years back I'd actually say that what killed most of my creativity are computers and the Internet. They simply offer too many distractions and cannot replace the intimacy of working with pencil and unlined paper. But maybe it's just the way I use it -- e.g. that I answer questions like yours and follow sites like hn etc. They offer pleasant/stimulating distractions but on the whole ... Maybe it's a good idea to display your question as screen saver.

Nice quote although my habits were much better when I was 30 than they are now.