Mac OS design at the time was so good that I switched from Windows to Mac and never went back. Been over 20 years now.
Now I find myself frustrated with Mac OS quite often, but the competition is so bad that I'm just kind of stuck.
I loved the "stripy" windows. Things lining up perfectly on the horizontal stripes were somehow so visually pleasing.
I tried to replicate this look in my Java Swing UI using a commercial Aqua-like look&feel, but got hit by issues with controls rendering their own background, resulting in stripes being misaligned.
I was so disappointed when Apple phased it out later.
What all the copy cats missed (Windows Vista, Linux themes) is how consistent and usable everything was. It looked great, but better than that, it worked great.