I have found by being nice to guests and giving them a moment after my work is done and even a few tips has made me a friend rather than competitor.  When I have to do my formals I would ask them out loud to refrain from shooting and as soon as I was done I would pose the group for them and they could shoot till they ran out of disc, film or battery.  As long as they respected that, I had no problem.

After each sequence I would tell my tell my Official Helpers, Ok, ready, now all on three. Then count it out, two, three. Thats insured the ten folks with cell phones and point and shoot all got the same exact shot, period!  They literally just signed a no competition clause and usually all the flashes interfere with each other,

Then after that moment,  I’ll say something like “The Paparazzi will meet outside the church by the steps after they come out and you see me set up”. It has worked every time. It’s also a great time for card giving and you would be surprised at the referrals you get. They love you for this.

I have business cards that are printed “Official Paparazzi” and when we do the informal shots at cake, and limo and tosses, I tell them all to hold and AFTER I shoot, I yell Paparazzi time and they all come forward and let them have a good time. 

What do I care if they shoot a set, you think the point and shoot at fifteen feet and eight people wide is competition to my speed lights and Nikon 900's or a Norman with 400 watt seconds. 

Half of those point and shoots won’t even work at the distance they are at so I push them closer so they do come out.   Sometimes I have taken an advanced amateur who got in the way and made him hold the lights so that took him out of the picture but he learned something and appreciated it. 

Why the Official Paparazzi cards? They are my business cards on the other side and you wish you had a dollar for everyone that found me a wedding. Most of the snappers are friends or members of the wedding party and they get married too. What a time to make friends and future clients, not enemies.