I like to use my keyboard as much as possible. Once you start to get proficient with only using your keyboard in Visual Studio, you become more efficient.
Visual Studio 2012 added a special tab that sits to the right of your tab-bar. This tab is used when you open files from other places than the Solution Explorer (i.e. F12, ReSharper's CTRL-T, etc.). If you intend to keep this tab open (instead of replacing it when you issue the same command for another file), you can click on the little icon on the tab (next to the X), or you can use:
Now, the tab is part of the fixed tabs on the left.