For some people, getting to learn new apps is half the fun of computing. For other people, it's settling into a familiar, comfortable application.
Aside from essential applications you need to use your computer, you should never feel like you have to learn software that you don't want to. With Linux, you're in control, so you're free to explore as much or as little as you please.
Some applications you'll already know, like Firefox or Chrome browsers, Google Picasa, Skype, Open Office, and more. Others will be new to you, but you'll quickly find that Linux applications are designed for efficiency and ease-of-use. Give some new ones a try. We think you'll like them!