a Revit plug-in that you can assign 5 of your most often used views.
It is super simple in operation. When you run it for a very first time none of the views are set and you have to set those that you want to be able to access by clicking on the "Set/Reset" button
download page to get the installation files or download them directly from here.
DP stuff: QuickViewAccess for Revit 2012, Access Your Most Often Used Views
I requested a 2013 version from Dima Chiriacov in the comments - he replied that one will be available 'very soon'...
QuickViewAcces 2013 Revit Addin - dp Stuff
QuickViewAccess 2014 Revit Addin - dp Stuff