It's basketball season and your favorite two teams are playing. You pause the game on tuner 1 and switch to tuner 2. When tuner 2 gets to a commercial, you hit pause and switch to tuner 1. There you unpause it and watch the game until commercial, pausing it and switching over. Then you fast forward through the commercial and any slow parts, repeating the process as needed. You can watch the most important parts of both games nearly real-time. It's amazing how much time during a basketball or football broadcast is spent without the ball hitting the court.
Quite honestly, this feature is ten times more important than 30-second skip to a lot of people. I know how to operate a fast-forward without it being tied to some specific amount of time.