Yup! I loved that feature. My car started slowing down before the car in front of me did. It gave me the feeling that if the guy in front of me was thumbing his phone, that my car would slow down before he slammed into someone.
Actually... Was bombing up I95 in Connecticut one day in ridiculously high-speed, heavy as heck traffic, in a 2018 M3 LR RWD that had the RADAR, along with EAP. Was in the left lane of a four or five-laner, and we're all doing 60+. There was this pickup truck who was trying to get ahead. Nothing really obnoxious. Ducked out of the left lane, got into the next lane over, it moved ahead, then slowed down, and we sort of passed him. Just normal traffic. He got back into the leftmost lane and was three cars behind, no biggie.
And, suddenly, without warning, the car braked, HARD. And semi-simultaneously, the car in front of me was also standing on the brakes: Somebody ahead of us had come to a halt (heavy traffic, right?) and the Tesla was in Full Slow Down mode. At that instant it was pretty clear that the car was holding its own, so I snapped-judgement'd it and didn't touch anything. The car came to a halt with about a 6' gap in front (not much). The SO and I both reached up and tapped the dash, saying, "Good girl!"
Around this point I looked in the rear view mirror to see if I was going to be hit; luckily, the answer was, "No", since the person directly behind me had good reflexes, too. But that pickup truck had clearly been following Too Darn Close, dodged to the left to avoid a direct hit, and managed to scrape the left side of the truck on the Jersey Barrier and the right on the car two cars back.
And traffic picked up and those of us not in an accident on I-95 left.
I've thought about that event from time to time. The Tesla had a decent following distance when it all started; I hadn't been goosing the car or anything. But my first noticing of all the fun wasn't the brake lights of the car in front of me - it was the sudden deceleration from EAP, presumably caused from the detection from a car or three up the road that the RADAR was monitoring. I might have avoided an accident on my own; for one thing, the tires didn't run in ABS in that sudden stop, so presumably hitting the brakes harder would have worked.
But that's about the time that I decided that TACC was very definitely a safety feature, with likely faster reaction times than a human.