Incidentally, 2000 & ME had a lot of design elements common to them. There was a cleaner zen startup of the famous 4-color artsy shaded logo, an improved taskbar, various desktop shading, inbuilt media slideshow & full screen view option, folder & icon themes, which didn't look pixelated. Windows media player 7 was odd shaped but funky & having some visualization out of the box. There was winamp & Sonic media players too. All running in usually 32MB RAM & 20 GB hard drive. Screensavers & desktop themes could be installed (thanks Chip/Digit magazine!) & they were actually fun.
The teenage me installed a Virtua Girl desktop application out of curiosity & imagine the horrors when it starts stripping on your desktop, "standing" or "sitting" on the taskbar. Good grief! Those were days of having a single PC for the whole family.
Good ol' times.
Recently I used Windows 10 a bit because I had to test some things, and it's just so ... chaotic. Buttons everywhere, the "flat" UI just makes it hard to see what's what (including what's a button), and "clippy" is basically built-in now given how often the thing whines and nags notifications at you.
The Windows 2000 UI wasn't perfect, but it clear, simple, and mostly "just worked".