I very strongly disagree with you on this one. DUI is against the law because people die. People die. Innocent people die. They're dead. Dead. I don't want Johnny Drinksalot thinking he's "ok" because he's "done it all the time" and at worst he is going to get a "speeding ticket" after drinking a few, when he's really far beyond too drunk to drive. Have you ever tried to argue with a drunk person? Tried to tell them they're too trunk to do... well.. anything? Much less take away their "manhood" by not letting them drive their truck-nuts-wagging-2-ton-pickup-slash-sense-of-masculinity. Stupidity like this is how people die. And in drunk driving accidents, all too often it isn't the drunks that die, it's the people they hit.
And, no, you're wrong about cell phones too. Basically the same principle applies. It's the same crime. It's the same penalty. And it too should be stiffer. It's a fucking cell phone. Be an adult and text your mom later.