One tip to save time in post processing is to make sure that all of your camera bodies have the same time and date. Not ‘about the same’, but exactly the same.
Once you have imported your images from the different cameras in to your software program of choice you will simply be able to organise them by the time they were captured. If the cameras are a few minutes apart then the sequence of events can be totally out. This means a lot of manual organisation on your part and time wasted. There isn’t really another way to organise your photos as you can’t rely on the file number. Make sure that you add this to your list of things to do before each wedding and keep it in the routine just as you would checking your batteries.