I've found during my tests that the "Preview as visitor" action in the page editor is actually in the wrong place. It should be located in the page preview, much for the same reasons that we also have moved the "choose audience" action there.
The visual page editor is only about editing the page. Once you're done, you verify your changes in the preview, choose an audience and check whether that works well for all your visitors. Similarly, both "choose audience" and "preview as visitor" should be accessible to reviewers as well. Moreover, it's bad usability due to the risk of accidental edits that you have to "edit a page" in order to get access to the "preview as visitor" action.
Please move the "preview as visitor" action from the page editor to the page preview in Pages. Move it into the same group as "choose audience", place it right below that action.