I agree, and the metric for productivity should be clear, and measured, rather than recording and monitoring the process of work. The reason employers want to monitor process is because they cannot find a good metric for productivity, for which they feel cannot be gamed - esp. knowledge workers; you don't measure by lines of code written, bugs fixed or features delivered, as they are all surely game-able.
I believe trust and respect should go both ways, and there should be no need to invade an employee’s personal space with constant surveillance.