My memory is that, in the lead-up, the computer-dependent world had received a big splash of cold water in the face. The transition point was, in fact, critical. Much effort had to go into making for digitally accommodating a smooth transition.
Personally, I didn't know what to expect, and was at friends' place when midnight came and passed.
It's was clear that creating unnecessary froth had been some hustlers' method to make money, through public panic tactics of various sorts.
But the practical preparation for the 1999/2000 transition wasn't cheap. Within a short time, some experts had attempted a close calculation of the cost of the technical effort to avoid a dead stop in countless computer systems in government, banks, industry, commercial enterprises, etc. I remember reading an estimate figure of $7 billion (in the Western World?). Anyhow, I was glad this money had been spent on managing an ominous situation.