Sunroof is a must for me. I've had a sunroof car for 9 years. Didn't think I needed it at the time I bought it, but I got it anyway. Now, I will never own another car without one.
One of the best things about the sunroof is that, if the sun is out on a somewhat chilly day, you can open the roof, keep the windows closed, turn on the heater and direct it to the floor, and be comfortable and enjoy the sun even if it's October or November.
The only times I keep the roof closed besides inclement weather is if it's blistering hot and humid. Then of course it's A/C time. But other than that, the sky is my ceiling