It's something I have been guilty of in the past. I expect people to be competent and professional and so when they are, I'm not surprised and don't acknowledge it. I am learning though, that people like to be recognised for their contribution. It makes them feel like they have contributed to the success of the organisation. They are motivated to carry on trying hard.
Looking back at last week, how many people around you didn't do a bad job, made no mistakes, didn't require your attention? Maybe in amongst them are several people who deserve recognition and thanks. They will notice it and appreciate it far more than you, and it will probably affect their future work.
part of something (a big part Saying thank you will motivate people. My recent newsletter looked at the benefits to you of being grateful for the things around, the stuff that's made life that little bit better. However, it neglected to look at the benefits to your organisation.
Preople like their work to be acknowledged and when we don't notice, they get upset.