Narrator: it didn’t.
Now, that’s on me. My employers didn’t force that on me and my inability to say “no” is my fault, not theirs. But it taught me that I’m never not taking vacation ever again. I’m never making two connections to save the company $200 on a flight ever again (when others don’t and I’d still be in budget). I’m never staying late to do a job that isn’t mine because I’m afraid it won’t get done otherwise (it will. And if it doesn’t, it’s above my paygrade).
That doesn’t mean I don’t work my ass off or give 100% (if not more), but it took me until my early 30s to realize that the company wont reciprocate my loyalty.