I find some of the people who are most likely to accuse us of having metallic foil lining our headwear are those who mainly have used OSes from one vendor.
Me… I started with DOS, then Windows 3.1. A few years later I got to see Windows NT 3.1 Workstation, then 3.5 and 3.51, finally NT 4.0. I got introduced to Windows 95 about the same time I saw Linux for the first time. Red Hat 4.0 to be precise.
Since then it's been a whirlwind of OSes… OS/2 Warp, SCO OpenServer, FreeBSD, OpenBSD, NetBSD, IRIX, Solaris, Minix… Linux has been one I keep going back to.
So for me, I've seen where both Windows NT and Linux started from and can appreciate how they've both developed. Some things change, others remain the same. I no longer have to remember what RAMDAC chip my video card uses or take educated guesses at modelines. I no longer have to go hunting for third party software for system essentials like a network firewall or file system maintenance tools.
Both OSes have matured greatly. I put myself firmly on the Linux side of the fence however, as that side of the fence seems to be in good company. A lot of software that runs on Linux, can also be ported to MacOS X. The same software can be a royal pain to port to Windows, an OS that's never understood the meaning of fork(), and whose cheerleaders are all too keen to try and point out the superiority of PowerShell over the Bourne shell, whilst completely forgetting why the Bourne shell gets used in the first place.
As for Microsoft… without a doubt the sun is setting on Windows and Office. Certainly in consumer space, it looks to be moving towards tablets which are prodominantly iOS or Android. In business… there's a lot of legacy out there, it'll take a while for the flood to drain out to sea. Windows Servers? If BYOD is our future, then our future is going to have a lot of non-Windows workstations, something Windows Servers have never traditionally been good at managing.
I think relying on a single vendor has always been incredibly risky. We saw this with IBM, and Novell, Apple seem to have reached their peak now. Your turn, Microsoft. I shall sit back and wait, I shall not however, hold my breath.