As an aside - as someone who used ME back in the day, I feel like I honestly had more problems with Vista. ME was a downgrade from 98SE for sure, but I don't remember it being the same level of performance and reliability degradation that I saw going from XP to Vista pre-SP2.
My ME machine would reliably BSOD when I opened / closed the CD tray.
Millennium _was_ Windows ME, millennium edition. Windows 2000 was completely different. :)
IIRC ME would just randomly crash explorer.exe with task bar disappearing but you could recover some of it. On Vista it was just overall sluggish and laggy visual experience.
I did later run Windows 98 on my kids' machine for games, but I never tried, or wanted to try Windows ME.
Windows 2000 has the best look and feel for the GUI, but I do recall that I usually saw my first Explorer crash within an hour of a fresh install. Windows 7 was peak Windows because you could still get the "Classic" Windows 2000 theme, but with all the under-the-hood improvements. I've gotten used to the Windows 10/11 UI, but I've never liked it and just wish I could go back to the way it looked when Microsoft cared about usability, as opposed to trying to make everything look like a phone.