Easy Camera Addon - Camera Manager places its controls in a section of the Blender N-Panel, keeping the most used camera options in one place instead of moving through multiple menus to change settings for a single camera. From that panel you can add a camera where you are looking, set an active camera, delete cameras, and switch between them.
The panel includes Camera View, which switches you to camera view automatically when a camera is added, and Camera to View, which lets you move your camera in camera view like you move the viewport. A Transparent toggle controls the background transparency found under Render Settings > Film > Transparency, and a camera icon toggles between camera view and viewport. You can adjust the passepartout alpha, change the camera type between Perspective, Orthographic and Panoramic, edit basic camera parameters, and use an option for depth of field.
Any existing camera can be brought into the workflow with the Convert to Easy Camera button. The add-on ships as a EasyCamera.zip file, and a demo video is available.