I actually find that this makes things much worse because when people inevitably cut between you and the follow car BOOM hard brake.I find autopilot pretty good on the highway, its mostly confident. Setting a longer follow distance (like 7) really helps smooth it out.
Some people get really annoyed at folks pulling into the gap it leaves when you do that, but I really don't care. Its not that important to me.
I know some folks who get so annoyed that they have it set on 1 or 2, but that just makes the car brake harder so makes it worse not better.