Quote from VaultTechy »I've seen one guy do this before and I'm not a fan of waiting for all of the reorganization
Yeah, sounds like you haven't had a good experience but I would say that it sounds like the guy in your playgroup who is doing this doesn't have a good system. He shouldn't be "grinding the whole procession to a halt"; I agree with that. If you're organized it takes 2-3 minutes to switch decks which shouldn't be too much to complain about since I wait in between games for people to go to the bathroom, order a beer, etc. all the time. And the waiting really only matters if he's one of the last two people in the game; otherwise you can shuffle up while the previous game is finishing.
Also, as I mentioned, other methods that can help your friend save time as well are proxying the shared cards (if that's acceptable in your group) or having a deck or two that doesn't use the system.