I have a friend who would also follow too closely to the cars in front and got one of these. Her rates went up and she eventually got into an accident (no injuries to anyone) because she would follow too closely and still break too hard.
Now she still has the machine, still follows too closely, and still breaks too hard in her new car...
Good it worked for you though!
A cousin of mine is abysmal to drive with as a passenger. He follows too closely to the car in front of him, regardless of lane / speed. He will slow down, follow closely, and then aggressively pass. Repeating ad nauseam.
No smooth maintaining of speed and nice passes as able without slowing down.
Surprisingly, his accidents have mostly seemed to involve gas pumps, barriers, and other obstacles at low speed.
This is left lane driving policy. I am like this, and I was not at first. What makes you drive like this is rush hour traffic. "Move up the lane or move out of the lane" is the sentiment, basically. As others have noted, it is essentially an adversarial process. If you drive nice, people cut in front and you're unable to drive nice to both those behind you and in front.
Letting them "cut in front" is good driving.
If you have to keep significantly slowing down to get the gap back, that's perfectly nice to the people in front of you but it's not nice to the people behind you.