And, conversely, IT staff can and do massively impede productive workers... the parts of the company that make money. Perverse security requirements, upgrades that remove functionality, ridiculous delays to get the simplest things done because users aren't permitted to do anything to their pc... And will often be quite condescending about it as well; after all, they're the wizards. Users are just muggles.
Who let the MBA in here?
The reason why worry kills more people than work is that more people worry than work.