I am not doubting you were productive with it. However that does not make it better, it just makes it what you know. User experience experts have studied this for a long time, and they all conclude that you need more than one button. (there isn't agreement on the best number as there are some trade offs, but one is clearly not enough)
The world has a real problem with people arguing what they know is best without any basis in reality. Even if there is a clear reason one choice is better, most arguments for the better choice end up being because they know it better not the clear reasons it is better (see most metric/imperial arguments)