IoT scares the hell out of me.
Cell phones have already laid waste our privacy, but IoT will be pervasive and on a completely different level.
For now you can be reasonably safe in the assumption that if you talk privately with someone in person that no-one else will be listening. Not for long. Not once your clothing, car and every public space is connected to the internet. What to speak of embedded devices. It'll start with medical devices, but it certainly won't stop there. Google glass creeped people out, but that's just a minor shot across the bows.
I don't think, as a society, we are ready for the ramifications. We desperately need modern legislation that's sensitive to rapidly changing technology to protect us.
I guess people may have felt a similar way about e.g. electricity to the home, but we're rushing headlong into surveillance and control hell. So far data gathering is like finding a thread in an avalanche, but the tools are rapidly improving and we're handing over our information hand over fist for some minor conveniences.