Steven Johnson argues that over the years, audiences have become much more sophisticated in their TV watching. Today, we have no problem watching shows like “The West Wing,” “E.R.,” and “The Sopranos,” which have multiple subplots weaved throughout several episodes, whereas in the past, most TV shows like “Bonanza” or “Dragnet” would consist of one main plot and maybe one subplot. That’s right: feel good about being addicted to “24!”