"Today we have access to so many other ways of disciplining children without smacking them, that a lot of effective discipliners who don't smack, see it as a rather unhappy way to parent to threaten children with a smack."
That really makes me laugh. As if there have been some profound "parenting" (another hateful word, parent is a noun only) inventions since the 70s. As if the genius who invented "time outs" and "naughty steps" could get a patent on them. Why not bring out a "naughty step" with built in timer as a new "parenting" invention?
Seriously, there were plenty of good parents throughout the ages. I think a lot of our parents (who brought us up in the 60s and 70s) look at the spoiled, out of control children today and think that the present generation has forgotten how to be parents and prefer to be their childrens' friends to the detriment of their children.
Parenting involves discipline. It is the side of it which is no fun at all but it is an obligation in for any good parent. What method is used (smacking, naughty step, time out etc etc) is very secondary to how it is administered. If explanations are given first, then warnings and, above all, a parent is consistent in the application, then, for me, a smack is better than the "humiliation" punishments which involve either a form of imprisonment or ostracism. Each to their own, though.