Not long after I joined our company the pilots had a vote about keeping them.
It was overwhelming in favour of keeping them.
i think that it adds the final touch to the uniform. On the two occasions that I forget to bring it to work I felt very strange.
Some people don't bring them in and others bring it in but carry everywhere.
Our last GMFO was very keen on our wearing them (ex military).
They are part of our uniform and I would no sooner think not to wear them than come into work with white socks and trainers or not wear my tie.