I draft and have been drafted. Only happens once or twice a year that I match speed and route with someone enough for it to happen. When it does we're usually doing around 25mph. Not a big deal, the way I see it we're just giving each other a break. Would never do it on a crowded MUP. When approaching a potential obstacle I back off. Maybe it's just me but I'm aware of my surroundings enough that it's never a surprise when someone takes my wheel.