While I find lane assist annoying unless cruising on motorways, and speed limit warnings can also be tedious, I've had emergency braking on two cars and think it is a good thing. Apart from the very occasional glitch in a city, it is unobtrusive when implemented well, and I certainly never saw it triggered when making good progress on a nice A or B road. On the other hand, I did mildly rear-end a learner driver when they stopped suddenly at a roundabout give way about 15 years ago, so I wish the technology had been in my car then! I've also been hit from behind at junctions twice, once writing off my car.
I turn off various aides at times (and some cars make this very easy, like my old GR Yaris), but I've never once felt inclined to turn off emergency braking. Similar to car airbags, I hope to never need it, but quite happy to have it in a car just in case.