So I felt some similar frustrations when I was planning my wedding, being in the IT industry, emails are responded to within minutes let alone days,
BUT TRUST ME WHEN I SAY THIS:
Once you are there for your weddings, you will see that the WC, are running around out side ALL DAY LONG!!! Serisously they are running around from 6am until wedding end at 10:30 pm, I dont know how they even respond to the Brides emails at all. The jobs DEMAND that they be supervising set ups checking things out all day long, I am suprised they are even able to respond to emails with in a weeks time frame.
They work super hard. get 99% of every detail perfect on the mutliple weddings they have each day. They do this kind of thing all day every day, and will have a solution for just about everything you throw thier way.
I promise, promise, promise, once you see it all in action you will have a new found respect.