The catch is that while this addon is free, you can only use it (or any other addon) with a retail version of Visual Studio. If you're using the Express version, then you're out of luck.
This is completely overkill and will make the code look horrible, but you could use the region stuff if you really wanted to be able to collapse/expand code sections: http://msdn.microsoft.com/en-us/library/b6xkz944.aspx