Interesting comments.
I too had a loaner for a day (500 miles actually). Lane departure was a very, very mild buzz, like going over a rumble strip: Bz Bz Bz. If you were actually changing lanes and used the signal, the buzz was not there. I could not say it was annoying, at all. Noticeable, yes. Barely. When in the truck lane, the rough highway surface was louder than the buzz.
As to the seats being higher. Really? You know, they are adjustable. I adjusted the loaner seats to exactly what I was used to in my "old" VIN 00064 car. No noticeable difference, and I have a bad back and am 6' 5".
On the loaner I had, there was no "speed assist". It displayed the speed limit accurately on the speed dial for about ten seconds, and then went back to "regularly scheduled programming". I chose to drive about ten mph over the limit. Did it do anything? Other than that the speed dial turned from blue to gray at 65 mph, to remind me of the speed limit, there was nothing.
I figured I could turn it off, but it was so innocuous, I couldn't find a reason to bother.
As far as "big brother", I drive with my wife, and she never bothers about my driving other than to tell me we are not in a race. Well, since she's with me, I guess "we" are, sometimes, but the dashboard assists were never on that level. I think Tesla has done a stellar job of figuring out the right levels here. I liked the tech. The car does not tell "big brother" what you are doing other than its normal job of recording everything, which would never be downloaded unless there were a glaring reason. Tesla doesn't care if you are doing ten over, or 50 over. The cop on the other side of the rise, with the radar gun, though, might.