Well my last company didn't have a Chaos Monkey. But we had at least once a year that we had to fire up all the systems at the DR site. And that included getting a temp code if needed for some systems. We explained to the vendors that if they couldn't handle us doing a DR test, then we would have to find a new vendor. Not a single one let us down.
We also had some functions at the DR site we would test back at the primary location. (The e-mail Groupwise setup done in a graphic looked like a cloverleaf with a small highway to nowhere.
At the same time the need for the Chaos Monkey was limited from the simple fact that basically every single server that was in production was touched everyday.
There was a stack of test servers that weren't used every day but the upgrade cycle of over twenty-five SW packages usually was going to be touching any group of them within two-three weeks.
A little bit of this and a little byte of that can cause bloatware.