to simply sever a plate of food in front of someone does not require or deserve a tip. its a process like flying on a plane, or buying a newspaper in a shop or a bus trip. If you have special requests / are given extra help in sorting your meal, having wine/water poured for you just at the right time, are having your kids meal that you brought in with you heated up, are being given great recommendations on dishes / wines that you woulkd have missed otherwise, then it stops being just a process (like a KP simply processes dirty pots etc). At this point the person deserves a tip, they have gone beyonf the process.
I agree.