It's more the Windows overhead that could be little easier anyway: no antivirus or spysweepers to buy, install or manage, or worry about conflicts, or setting up a secure Windows install, and then those occassions where you have to reinstall..
But, I think you probably have your stuff pretty tight and down to an efficient maintenance schedule. It's more the average Joe, Jane or Grandma Sue user who sucks wind on security.
Then there's the business user - usually an exec or laptop user - who seems to find a way to get infected every month or two. There's quite a bit of overhead in corp technology spent on keeping it as productive as it is, still stuff gets through and even if it doesn't that's money that could be spent on better things..