I went ahead and loaded 2019.32.2.1 yesterday and drove about 90 miles. AP functionality was very clean, but not noticably different mostly.
I did not see an increase in MY nags, but that is pretty much that it went from zero nags to zero nags. I didn't notice a change in sensitivity. The weight of one hand and forearm on the lower quadrant of the wheel still resulted in no nags.
I did not drive much on roads with oncoming traffic, so can't comment on the reported moving away from cars in the other lane.
I did, for the very first time ever, put on my turn signal and have the car take an exit from the freeway. I don't really try this very frequently, since I know it doesn't work, so I don't know if this is new, or maybe just the configuration of the particular exit.
I still got a couple of places where it felt like the car was going to phantom brake and made me move my foot to the accelerator, but it seemed to recover.
All in all, AP worked perfectly -- enough to be boring, which I guess is what we want. The only place I noticed disengaging was to move in/out of the HOV lane, which is a single solid line separation on these roads that AP will not cross.
I am having a hard time imagining that Tesla is doing anything to update or improve AP1 software, unless something drastically wrong is discovered. Why would they? Seems to me that their efforts on AP2 would keep them so busy that they have zero incentive to wok on AP1. And frankly, I hope they leave it alone -- don't fix what ain't broken!