You are right about the amount of big-day work though; we had a huge spread of food and booze and I remember eating a couple of crackers and a single glass of wine over the entire evening. This was a very relaxed version of a wedding as well; too much glad-handling to actually have fun.
15% of the weddings I've been to didn't have a groom
I've had two weddings and attended many many more. 90+% of the time is completely forgotten. The rest is good or bad memories that are largely disconnected from the service/goods quality and the price. I've seen success with plastic cups and failures with crystal.
(Interestingly, the vast majority of the "bad" events came from the wedding officiants, with photographers coming in at number 2, neither of which correlated to "quality")
It's pretty easy for a wedding and reception to be boring for your guests.