Depending on what the code is, it could be something as simple as a loose hose(emissions) or loose connector. Knowing what the code is at least gives you the opportunity to try and diagnose it further to get you back on the road. Or at least know that it's not a serious issue and you are safe to continue driving. In the case I mentioned above about the code the Pulsar triggered, I knew what it was, was able to clear it's and regain my cruise control. But being able to read the codes is only as good as the knowledge of the person reading them.
Not sure what else there is to explain on the be edit of having a code reader. Obviously every person is different. I probably use mine more for viewing different gauges, just for my information, than checking or clearing codes. With the Torque app, you can configure a custom "dashboard" to display the information you want to see, in real time. Lots of sensors you can monitor that aren't available in the EVIC screen on dash.