We did a day trip from Lafayette to Petaluma and back today (part of which involved me trying my hand at milking a cow, but I digress). For non-Bay Area-ns, that's about an hour each way, almost all freeway driving.
My wife drove the outbound leg totally manually, and spent this time getting used to the new 7.0 UI. She has less than 10 hours of driving time in the Tesla, she drives a BMW 3-series. The new UI really made her uncomfortable (she wants the 6.2 UI back too), until I told her that if she's the one doing the driving (no AP or cruise control), she could ignore almost everything in the middle of the IC except the speedometer.
I drove back, partly on AP in light to moderate traffic on a freeway at night. It started off doing pretty well, no surprises, although I took over for it a couple of times when I thought it was getting too close to a car in an adjacent lane, and one time on a descending turn when it completely gave up. As many other posters have noted, situational awareness, and being ready to take over, is key. Ultimately I went back to manual control, because the tones from switching AP on and off made my wife pretty nervous. The constant stream of questions from our 8-year-old son wasn't helping...driving with AP engaged is actually more work at this point because I have to monitor the AP *and* answer all his questions about a system I'm just learning about myself...sigh. Maybe I need to do a long solo road trip somewhere!
(I charged at the Petaluma supercharger for the first time, just for the heck of it. Saw everything from a very low VIN Sig P85 to a month-old S90D and had some nice conversations with some other owners.)