My kids are grown, but I did spank some of them. I used spanking less and less as my children grew. The last child I never spanked. That child was a lot easier to manage though.
I believe in a swat on the bottom to protect little ones from themselves. I also think I spanked my older children more because of encouragement from the dubs. Spanking out of anger is never a good idea and I think I crossed that line when I was a young parent.
There is no one size fits all approach to raising children. Each child differs in temperment. I now believe that spanking a child that can be reasoned with should be the last resort. Taking away privileges is much more effective and instructive. Children need to learn that behavior is linked to what they will accomplish in life.