Time outs DO work, if done properly. My children were never, ever spanked or otherwise physically disciplined. They are well mannered, reasonably polite (for teenagers....LOL!) teens. They have had ZERO discipline issues in school. I've had nothing but compliments from other adults on what nice young people they are.
I used time outs when they were little. Once they reached about 5 or 6, I used different methods, appropriate for their currency at the time. Right now, for example, my DD is disciplined by removing electronics from her, by being made to skip "fun" social activities, etc. But never have I struck her.
Both my teens have been fascinated by all the coverage of AP. They simply have never imagined that kids were beaten by their parents. It's mind-boggling to them. And, horrifying.
I will say that it has given them both a new found appreciation for their parents.