Its not as if you are required to tip people. The worst thing is fancy bars and restaurants that just stick a service charge on your bill. So you havent really got much choice.
If you are happy with someones service, or you grow fond of the person that does that small job for you each day, then its not really that bad to give them a little christmas gift.
My postie is a right miserable sod. But when im out on my round i happily chat to people and even though ive only been doing it a few weeks a number of them know my name from asking me, and they chat to me each day.