I drive over 200,000 km's/year for the last 20 years. I'm not saying that I am the authority on driving but just to suggest that I've had the opportunity to observe a lot of drivers over a long period of time. In that time we've seen vast advancements in technology, vehicle design, road construction and traffic volume. The only thing that hasn't changed is poor driving habits.
For example, when your Daddy taught you how to drive and said "stay in the middle lane on the highway because you can have to option of going left or right to avoid something" - he was wrong.
I can't quantify the number of drivers I've seen on the phone or using GPS over the years but I will say that overwhelming majority of them are driving just fine. The problem drivers are; simply oblivious to what is happening around them or inconsiderate (aggressive, over-confident, under-smart).
With that said, if you are talking on your cell phone, texting your spouse, surfing OFC, pouring coffee or curling your hair - have it at it! Just know your limits, be aware of your surroundings and be predictable by maintaining your speed and signaling your intentions.
Those that act within their abilities don't require a law to tell them to do so. All in favour of this law should have a bumper sticker so I know to stay the hell away from them.
-Brian