I always got pissed when a JW old-timer complained about corporal punishment being "illegal" (even when it wasn't). In fact, when they did it too often, I'd call 'em on it, too (after I was well-grown up)... "Wow, you must have really enjoyed it; after all, you complain about not being able to use it often enough that you must miss it."
Never got "counselled" for it either, and the looks I got were fucking priceless.
Personally, I think the threat of corporal punishment is a lazy-ass shortcut just to get kids to do what you tell them right now, instead of leading by example or explaining to the kid why they needed to do something (which explains why apocalyptic religious folks are so quick to resort to it... The End is about to drop any minute, after all, so they're kind of desperate to get kids to behave "righteously"; therefore, threats/acts of minor violence are justified to save 'em).
Sure, it can get immediate short-term results, but from what I've seen, though, it doesn't really produce any demonstrable positive long-term effects, and actually engenders a lot of resentment in many adult children against their older parents for the corporal punishments they received.
Trust me on this one.