The only one left is Windows 7, which I can't wait to get rid of in 2-3 years, once either Ubuntu or Android come into their own as more mature mainstream operating systems.
This comment was brought to you by the year 2006 and the letter Q.
Ubuntu has continues to improve in polish, stability and usability since then. There's no reason for you not to start making the jump now.
My recommendation is to start by replacing the applications on your Windows machine with cross-platform FOSS equivalents, if you haven't already. That way, the OS transition will be a lot easier because you will already be familiar with the software.
edit: p.s. I'm using Linux since about 97 and as primary system since sometime from mid-2000's.
Except you can't afford to live in high-cost cities if your savings is only 1 mil and you want to retire on that in your thirties.
I've already decided not to renew my MAPS and MSDN subs again in December thanks to the epic crack smoking going on.
My point, is you can find something to hate about every company or group of people.
Why so much hate?