This. I also work in the industry. There is a massive amount of truth to what you say here, but there is some truth to the submitters fears.
I deal daily with several large call centres all over the world. Each want different things from their "Bathroom break" metrics.
1) Some outsourcer call centres' clients pay for these metrics. Usually as a summary figure on the campaign they paid for. These cleint pay big money for a campaign to be run, so they want to know everything... time waiting for a call, time on a call, time wrapping, time crapping etc etc.
2) Call centres themselves want to know about their own figures. Everyone has targets, SLAs to work to. Knowing how productive you have been is sumarised, and not focussed on individuals. Sure if 50% of the day was spend in the bathroom, you need to do something about it!
3) To use as ammo. If you have an underperformer, pain int he arse, or otherwise undesirable person you want rid of, this is good ammo. Getting rid of someone for putting "bathroom break" while actually smoking/talking/whatever is great for a falsifying records offense. Sickening but have seen done.
3 is a little tinfoil hat, but I have seen this done more than once.
In short, there is probably nothing to worry about here, its pretty normal in call centres.
Also, submitter, dude, you posted on slashdot with a reasoned question... Surely a call centre is not for you? (ignore me if I am not seeing some big picture)