Not me, My puddle duck spread varies so much from day to day even hour to hour. I am constantly resetting my spread. If the wind switches, or the day becomes more or less cloudy, or I get bored. I am constantly switching my puddle duck set up. Puddle ducks, especially blacks and mallards are very smart (at least in my area) and they look for any reason not to decoy. I have never seen a straight line of mallards so I would never employ that technique to hunting them. I try to set up a few different "family groups" and make my spread look natural. It may save you a bit of time when deploying or retrieving your spread but I think you'll get better results in the way of finished flocks by actually placing your decoys carefully. Try to remember that the dumbest black duck is still much more cautious than the smartest broadbill. and I don't use even close to the number of decoys for puddle ducks that I do for divers, so I never have a problem with the time it takes to pick up 30 decoys.