The article is about Canada, but for EU law it wouldn't be a blanket rule that says that you may not be filmed while on the job, but rather that the filming must have a reasonable purpose. Filming the entrances for security reasons is such a reasonable purpose, but that means the footage may not be used for example to measure employee performance.

Your argument, and you see this nihilistic tendency often in privacy discussions, is also based on some strange notion that if your privacy has been violated once (and you didn't voice your disapproval), it may be acceptably violated again. I see no reason for this to be.