//I've dined at some of the most world class hotels known to man.//
Then you will (or should) realise that waiting (properly) is not an unskilled job and to suggest that it is insults those people who have chosen it as a profession. The problem in the UK is that many establishments employ people who are unskilled to wait on their tables. It is seen (as is evident from your remarks) as a menial job, something that people do when they can get no other job, something that students do for pocket money, something that people do to pay the rent whilst waiting for something better to turn up. But having a professional waiter/waitress serve you, one who knows about the food and drink they are serving, knows about how it's cooked, knows about the ingredients and most of all knows how to make your evening just a little better than ramming some food down your gullet from a cardboard box, demonstrates that the job is skilled and worthy of proper reward. Whether you choose to reward them additionally as a personal contribution is of course your choice.