PLau, glad you were able to react effectively. Traffic frequently moves 90+ on that stretch and you managed to stop the bike, kudos.
I want to point out a few things that others have touched on. Firstly if the lane of traffic I am driving in is moving faster than any other lanes I ALWAYS assume that another driver will notice and want to cut in! This keeps my guard up a little more than normal. Secondly, this experience is a great example of why everyone should practice emergency braking before hitting the roads this season! Especially if you have ABS you should make sure you know how it works and when it works and what it feels like to ride through it. I do, every year in fact and it has saved my @ss a few times.
I think you made the right move by letting it go at the time. Nothing good can come from interacting with someone so careless, especially when you approach the situation looking for a violent or aggressive resolution. I used to stop and flag people down and try to explain what they did and how it could have ended up differently had I not reacted in time. I would think that if somehow our talk could help save a life in the future then it would be worth my time. This was my old way of thinking but lately I don't bother much. Most drivers don't understand the danger because they are not riders. Most people don't really care about others - until it is far too late.
This reminds me of one occasion when it was raining and a car on Steeles Ave just couldn't wait to make a left turn into a plaza. He turned left in front of me (as I left a larger gap between the car in front of me due to the rain) and he tried to time the gap between me and the car in front of me. I I had to brake hard to narrowly avoid a collision but not too much as to lockup the wheel and dump the bike. I managed fine. Just the other day a lady cut me off without signaling and there was a police car 20 meters ahead of us. I pulled up beside her at a red light and motioned for her to put her window down. My intentions were simply to let her know that she changed lanes without even looking beside her and I had to slam on my brakes not to get side swiped. I just wanted to remind her to turn her head and look next time. She didn't roll her window down. She simple shrugged and mouthed "sorry" to me.
ABS probably did not kick in. I didn't notice abs vibration or sounds. I did however, notice the stall.