Doesn't save you... matter of fact one of the largest and most damaging worms/viruses in recent history only targeted and took over Macs...
and you *nix fan bois.... doesn't save you either....
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Agreed it does not completely save you. However a properly administered nix/Mac can be well secured. Windows simply can't as long as they operate from a central registry. The danger comes on Macs is when people get complacent and run from an admin account. As the old hacking adage says, "if there is a way out there is a way in..." so no connected machine is ever totally safe.
All this talk makes me miss my Commodore 64, now that was a piece of technology!