The top of my head does feel a little warmer when in strong sunlight, like noon. I don't find it objectionable but YMMV.
As for the car being parked, when my car will sit out in the sun for a couple of hours I turn on the climate control with the app about once every 3 hours. Just me being obsessive. Yes, the car is going to get hot like any other, and the pano roof is going to make it a little hotter still, even though they've coated the pano roof to stop some of the UV and IR rays. If your car is going to sit out in the sun for long, and do so very often, I might second-guess the pano roof. Since my car stays inside most of the time, I have the pano roof and love it.