Will the same people being indignant to drunk drivers (which I have no problem with) do the same to people who admit that they talk on the phone while driving?
My guess would be that if several thousand deaths each year were linked to cell phone use, then yes. For all of the laboratory studies in a controlled environment done regarding reaction times while talking on a cell phone, to my knowledge there are no statistics showing the impact of cell phone use in real-life situations. If those statistics are published and show extremely high death totals, I believe you'll see similar outrage.
I think you're underestimating impairment at .12, by the way, especially if you're basing your assessment on your own self-awareness. The crazy thing about being impaired is that often, you don't realize how impaired you are.
We just saw the real-world effects of driving at a .12: on a clear roadway, a driver decided that it was a better idea to flash his lights at a guy crossing the road than it was to hit his brakes or to take defensive action to avoid hitting the pedestrian. If that wasn't impaired decision-making, I don't know what is.