I agree with that from both the photographers point of view and the wedding guest point of view. Whenever I'm at weddings and see the majority of people watching it through a camera, it just seems sad that they are doing that rather than just enjoying the moment. I think half the reason there is a paid photographer is just so guests can not worry about taking pictures.

Of course that said I tend to take a lot of photos at weddings, but I'd like to think Im more respectful to the pro photographer than most. I stay out of their way and rarely use a flash.