If you are only shooting weddings occasionally then this does give you a bit more peace of mind as you can check the images. But people used to do occasional weddings before digital.
Originally Posted by tkamiya
With either method you just need to know exactly what your camera and film/sensor is going to do to have the confidence that what you are doing is right. Once you have that, everything will be fine.... even the digital user will not need to look at the back of the camera after every (or any) shot!