As a wedding photographer, I photograph a lot of weddings with and without a WC. I have to say that there are benefits to having a wedding coordinator that if you have the money to spend, it's really worth it.
Basically if anything goes wrong on your day, like your sister forgot her shoes at the hotel, or the dj can't find your first song, or a whole group of your guests are late to the ceremony, and there is an un-ended amount of things that can go wrong, people will be coming to you for the answers on what to do.
What a "good" wedding coordinator does, is take care of those things for you. So that you get to enjoy your time with your bridesmaids or family before the ceremony, and so that you get to enjoy your reception too. No matter how much planning that you do, or organization, something is bound to come-up on the wedding day that will require your attention. For example, my sister had a really nice wedding, but didn't go with a coordinator, and there was a problem with the lighting that she had to deal with right before the ceremony. Do you really want to be thinking about how to solve an electrical problem on your wedding day? If you hire a coordinator, that's what they do, is solve that problem for you so that you're not.
All that said, if you have good vendors, perhaps a dj that is really good with keeping your reception on time, or a photographer that will create a flexible day of timeline for you, and a friend or family member that will be that go to person for you, you can have a wedding without a WC.
Good luck!
Dia
Dia Rao Photography
Dia Rao Photography - Mill Valley - destination wedding photographer
www.blog.diarao.com
1-888-222-5982