FWIW, I did my first climb on Saturday (Moby Grape - sweet!) with double ropes. Of course, I had read everything I could find about double rope management on the internet and, as a result, when belaying my second I treated the ropes as a single rope and laid lap coils across my tie-ins that run straight to the anchors. This worked very well, even when I had to take up different amounts of slack on the ropes at the same time - I just continued to coil as normal. When the second passed me and began leading, feeding rope from the coils was easy and snag free. I had no snags/knots.
My partner did not make lap coils, instead dumping them into a pile on the ground. This appeared to have it's drawbacks; at the top of one pitch he had to untie and we spent 30 minutes working multiple knots out so that we could restack for my next lead. As a result, when we climbed yesterday, he was making lap coils
I have one of the Metolius rope things and do find them useful for managing a single when not swinging leads (e.g. I lead all pitches so we have to flip the stack and I can't tie into the anchors with the rope and instead use a cordalette). But they are an extra piece of gear and I am carrying it less and less.
Again, I'm just getting used to them but for now I will be sticking with the lap coils and coiling them together.