What is an unplugged ceremony and should you be having one?

There are so many beautiful, special, once-in-a-lifetime moments in a wedding ceremony: the walk down the aisle, the couple’s faces as they see each other for the first time, the exchange of rings, the kiss. So, the question is, do you allow your guests to document these moments on their own phones and cameras or do you have an ‘unplugged’ ceremony and leave it up to the professional you have hired to capture them just for you?