I get around this by using the volume control wheel to let it know I'm paying attention.
I use AP for about 80% of my driving in a small rural New Mexico town. Yes, I have to take over to pass, to turn onto a different street/road, at stop signs, and if I'm the first one at a traffic light. But I still love it. I tried going a week without it and I sorely missed it. It's really great in traffic "downtown".
There were several things I learned to make using it easier.
1) Using the volume control like I mentioned above.
2) I use light upward pressure on the right stalk to disengage AP and TACC. This frequently happens around the same time I'm using the left stalk to signal a turn.
3) Pressing the on-screen speedometer when AP is engaged will set the max speed to the current speed.
I'm mostly driving the same roads over and over. I learned how to mesh with AP, when to use it and when not, where it screws up, etc. like
mtbwalt said, it takes care of the drudge work so I can pay more attention to what is going on around me.
Kyle Conner from Out of Spec Motoring also gives AP rave reviews. He does a ton of driving and says AP makes highway driving so much easier. He has reviewed almost all the other autopilot systems and says
Tesla's is far superior.
It's probably not for everybody but I encourage you to give it a chance and try to figure out how to make it work for you most effectively.