I have heard this from my clients more times than I can count on my 2 hands. The reason it is an important tidbit of info is because it will without a doubt have a great impact on the direction we go in planning & designing their weddings. It's great because you get a true impression of what its really like. Kind of like trying a dress on. What its looks like on the hanger is never what it looks like on, and it never looks the same on 2 different people.
Okay, so the lowdown. First, nobody wants to have a wedding that resembles that of a friend of theirs. That's like plagiarism! Although flattering...its just not where you want to go. Second, its a great way to note things that you do and don't like about what happens at weddings.
So let's say you go to a wedding and you love everything about it. It's easy to take the foundation of what you saw and loved and make it your own. Make a list of everything that you loved about the wedding. Also make a list of the things you didn't like (if anything at all). Take the lists to your wedding planner. Now you have a foundation to build off of. Your planner will help you find a way to make the things you mentioned unique to your wedding all while retaining the elements that made you excited about them in the 1st place. Really, its the same as looking at the real weddings featured in magazines and online- only experiencing them in real life is so much better!