Anyone who worked in any industry or sector that had technology or product that used two digit datecodes know that they were preparing for Y2K years before it hit. No one wanted to be the ones who ended up with the shame of having caused outages. No one wanted to immortalized in print and media. From financial systems, telcos, and the grid right down to thermostats, GPS receivers and PCs. Everyone was providing patching and updating and it was only the sensationalist tabloid news hacks that were whipping up the hysteria
So, did programmers in the 1980’s think this whole “computer thingy” was just a fad that wouldn’t last twenty years? Lol!
During that time I laughed at the Y2K "doomsters" but it is certainly true that corporations took rather strong measures to make sure their systems were up to snuff.