According to a survey by Intelligent Voice last fall, only 15 percent of iPhone users have used Siri in iOS7. If you're not already using Siri regularly, you should be. Why? Because Siri makes doing certain things on your iDevice so much faster.
For example, many of iPhone Life's Tips of the Day start by saying something like "Go to Settings>General>Accessibility." This requires you to open and scroll through two different menus. With Siri, all you have to do is say, "Siri, open Accessibility Settings." or Message Settings or Privacy Settings, you get the idea.
Other things that are much faster with Siri include: