Maybe it’s cause I’ve never actually used it, but I really only care about a stable / well supported Bluetooth connection. I have a holder for my phone for when I use GPS and basically never interact with it directly after it’s set. Only real interactions are media controls via the steering wheel. The only use cases I can see car play helping with are those who take a lot of calls/texts in their car while driving and…
The ability to just get in your car and have the phone-powered interface right there without having to take your phone out of your pocket and mount it in the holder is something I didn’t ‘niceness’ of before experiencing it.