I think the only reason I was able to get through my PhD was because I am used to the work culture and expectations. After going into the industry in a relatively healthy and good company, I realized just how much stress I had and how bad it was in academia. In a way, the grinder serves as a test of willpower and discipline and those who could persevere through it can say they have the mental fortitude to handle stre…
That's a very broad generalization. Everybody has a different experience, depending on the field, their advisor, their lab, their skills, their personality and so on...
To me, a PhD was pretty much like any other job. The last couple of months were bit harder because of the final deadline, but nothing drastic when you're young. My current job in industry is more stressful overall.
What sucked for me was after the PhD, being an academic, but it's another story.