Boy my experience has been quite the opposite. Two hours on road to Boston and then back, and the auto turn signals worked about 30% of the time. Mostly, after a changed lane, my blinker continued and I needed to manually shut it off. Further, I think the manual shut off is more difficult now that the auto switch has been activated.
This was the one feature in the new holiday download I was actually looking forward to using. Not anymore. This has been the most disappointing holiday update. Truly underwhelming.