If you're in the market for a new-to-you car, then I recommend looking at the model years where they switch from wired car-play to wireless car-play and buying the previous model-year. Typically this difference of one model-year can add thousands to the cost of the vehicle, especially because wireless car-play is so coveted. The experience of wireless is fantastic, but is it worth several thousand dollars? Maybe, but…
When I looked into this previously, the delay seemed pretty significant, not just upon auto connect. Can you recommend your dongle?
Initial connection is a bit slower than wired, maybe 20 seconds or so, but it's up and running by the time I'm moving my car.
There's very small amount of input lag for stuff like skipping songs or pause/play. I'd say that lag is almost exactly the same as when I used to only use bog-standard Bluetooth to connect to a head unit with my phone so I think that's just the downside of a wireless connection-- wired doesn't have this lag.