Not so much anymore but at my last couple jobs I did a lot of PID (actually PI) tuning. It was for chemical control so very slow action. I never really did any math unless I was having a particularly tricky time. Usually I would just tweak the gains manually based on trend data

Man I studied PID in Uni, was interesting to learn Ziegler-Nichols etc

Well it turns out you don't get to apply most of the stuff you learn once out into the workforce

Went to school for Mech E so I learned about PID loops and state space controls and other stuff. I'm only at my first position out of school but haven't really used it at all. In water/wastewater

I have a project coming up where I need to do one. I've never set one up before. It's kind of a fast action in the sequence so I think it's going to be tricky. I have to do 3 fixed speeds of forward reverse on a saw blade carriage, and then slow forward down based on blade motor amperage. But Rockwell has a PID instruction and you just enter in your tags as needed.