It's a little like a public health success: if done right, the worst that happens is that people have to prepare, and people complain about it, but disasters are avoided.

Pre-Y2K there was a lot of fuss and hand-wringing, but there was also a lot of software development that happened to ensure that Y2K would not be a disaster. So then when Y2K rolled around the preparations mostly worked.

My first programming job in high school was over-hauling a (mainframe-hosted) code base for handling lab data at a hospital. This was in the mid-90's; before most of the Y2K fuss had started. Without my work, pee and poo samples would be time traveling from the late Victorian era. You're welcome.