Behavioural economics is now helping to explain the commontendency to procrastinate over decisions such as joining retirement-saving plans that would be in individuals' long-term interest.
Even with reams of supporting data it is vital to step back, employ some common sense, and ask why a tendency (because some are just that, tendencies) may work.
But, in terms of technology making weddings horrible, how about the much more common (and super-obnoxious) current tendency of people other than the hired professional insisting on taking pictures during the ceremony?