After Effects does have the reduce project tools but this looks like it does a real deep clean of your whole project, even solids get sorted. The other one I chose to put up is this interactive grid tool that seems to have every type of grid layout you could possibly want.
I think I need to get this since I'm a little artsy and loose with my layouts some times. The other new plug-ins are worth looking into, there's an interesting real-time interface plugin that works with the site projection app Millumin, a little pricey but if doing on site video projections is your thing...