I don't view code as lines, but rather as chunks of logic. When I'm writing, I don't need to see what's on the screen because I already know how it is; the task is transforming it into how I want it to be. The process goes: thinking (5-10 minutes), typing (30 secs to a minute), thinking, typing. Most of the time I'm not even looking at the screen, even when typing. The typing part is just writing the stream of completed thoughts to the computer.