Comfort and Convenience
Cabin temperature is a good example: some people are comfortable a few degrees cooler than their passengers, and preferences shift with clothing, time of day and how long the journey has already lasted.
Safety and Driver Assistance
A short pause before setting off is worth taking. Locating the hazard lights, the demister and the mirror adjustment while stationary means those things are not being searched for later, and preparation is simply easier done at rest.
Multimedia and Connectivity
Phone battery is the usual city concern, since navigation drains it during exactly the trips where it is needed. If charging is available on board, the practical value is arriving with enough power left.