If you want the job, then you should display good manners and professionalism by writing a thank you note to the person who interviews you.
The comments on this post as well as the comments on the article’s site are eye-opening. Since when is being polite something to be disparaged?
I have not, and will not, extend an offer of employment to anyone who does not send a thank you (which basically tells me that you want the job.)
Most of the people on this thread are technical engineering types. The rules are different for them. There is very little BS factor in these types of positions.