For real. Doesn't help that the three/four finger swipe between full screen windows/workspaces has a mandatory animation that you can't disable (you can turn on "reduce motion", but it simply changes the scrolling animation into an equally time-wasting fading animation).
Virtual machines aren't the solution for day-to-day computing though. You're missing out on the graphics acceleration, being able to plug things in that just work, and so on.
My custom XFWM theme has square corners on windows without focus and large-radius rounded corners on the one window with focus.
The square corners are part of a 2 pixel wide border (one black, one white) because who needs to waste space on handling things we aren't manipulating? But the title bar is high-contrast, because you'll go looking for it when you want to switch windows.
The round corners go with a fairly thick border in a customizable color, usually something very bright in the yellow, orange or cyan ranges. When you sit down, you should immediately know what is active.
If I could run the Windows 2000 UI on a modern OS I would but any recent clone/theme/etc feels too uncanny valley.