Believe me, they haven't gotten such good manners and behavior by silly timeouts, or counting 'til whatever number, or silly stuff like taking TV/games away or grounding them. NOPE!, but by good spankings when they got out of rule!
Maybe in their case, but different things work with different kids. Timeouts and taking away things works with lots of kids.
The ones who never received physical discipline were the ones that were disrespectful to peers and those in charge
Just because someone chooses not to smack their child does not mean they will end up being disrespectful or unruly, some will some wont, just as some children that were smacked will also.
The main thing a child needs is consistancy in discipline and they need to know what is and isnt acceptable and why. They learn this through talking and reasoning.