Ironic that you should post almost my exact thoughts!
Other than trying them out to see how they actually work, I have not used them at all. SWMBO is the primary driver, and she rarely, if ever, uses them either.
However, they were a zero cost option and improve the aesthetics from the drivers view. They may also make it more attractive to a buyer when the inevitable future sale happens.
Also, I have paddle shifters in my X3, and those also see little or no use. They were not a selectable option but came as standard with the package options chosen.