For that are running hubs, do you notice much of a drag?
Yes, in the hand…. on the bike, on the move, in the dark, nope. I think I read somewhere that, for the 3W of output you get from the hub, the total drag on your forward motion is about 6W, which is about equivalent to total mechanical drag due to a well maintained geared bike (hubs, BB, seals, drivetrain etc).