You can quickly access views that belong to a controller by using the tiny "page with arrow" icon in the gutter:
Click the icon next to the method definition in the controller.
If a view file does not yet exist, RubyMine will prompt you for its filename.
For a list of all views and partials that belong to the current controller, do this:
Note that you can also go "up", to the controller, using a similiar icon in the first line of a view.