I think the Windows 98 frenzy was more nuts.
I've migrated from Windows XP to Windows 98.
At the time, I was one of those geeks who loaded it the very first day. I wasn't one of those imbeciles who lined up at the store at midnight but I did take the day off from work and went to the store that morning. I spent the rest of that day upgrading my two home computers and learning all the new tricks.
I never liked the clunky Win 3.1 and I was so happy to be done with that. Windows '95 was awesome by comparison. My computers suddenly looked and felt like Macs. No other upgrade since provided such a drastic overnight change.
Oh yeah, and I remember being blown away by the Weezer video that was contained as an "extra" on the Win '95 CD. Good memories. Seems like so long ago now...
BTW, I am VERY happy with XP. Most stable OS so far.