Then the people you work with are a edge case minority.
Windows absolutely and completely dominates the desktop computer landscape in both enterprise and home. Most estimates have it at 90-95% penetration worldwide vs mac/nix.
For anyone who may say macs are now selling more than ever before and that MS is losing market share fast, remember that apple is not even in the top 5 for computer manufacturers. For every Mac computer sold, there is 90+ Windows equipped computers.
While MS may be in trouble in the phone/tablet market, they still are on extremely solid footing in the desktop market. The question just becomes, what will become a desktop computer in 5 years. Will we all abandon what it is currently and move to tablets?