Especially in real-time. Presumably, it's easier to do so when watching on online archive where if you missed something (I had plenty of "null's" because I didn't know which D threw a long pass from his own zone to the O-zone), you just go back a few seconds on the timer and problem solved.
I'll do this again and I look forward to it. If nothing else, it forces great attention to detail when watching a hockey game, which isn't the worst thing in the world.
In addition,
this paper that was published for the Sloan Sports Conference, which includes @ShutdownLine (and @BSH_EricT, among others) is an initial abstract on the idea of controlled vs. noncontrolled zone entry dichotomy, and that controlled zone entries yield a much higher amount of scoring opportunities in the long run. Feel free to give this a read (that's anyone, not just the poster I'm quoting).