I'm not 100% sure "Where I was when cloud became a thing", but I clearly remember life before cloud and life as it is now. It's a cloud world. And we're all just trying to figure out what that means for most of us and the companies we work for.
I never worked in a data centre, and had to contend with installing rack mounted servers. Build and configure them, patch them into the network and get them the all clear to be used by whichever company had ordered them. I mean, I did this on my home lab with ex-lease rack mounted serversto learn etc.