This plugin uses non-published IDEA API.
SelectPlugin.SelectMethod. By default mapped to Ctrl-Shift-M. It will select the method including blank lines after the method. You can invoke it anywhere in the method (actually anywhere in the "selected" area, i.e. select method, now notice the area that was selected, you can select the method by invoking the action anywhere in this area). The action will select the javadoc comment (if present). The action also works for fields, static and instance initializers.