There are many features that I really appreciate. Understand that I have a 1932 car that has none of them, and I enjoy that car, too, so I don't need them, but I sure like them. So, in no particular order:
Sirius/XM radio - endless content.
Weather Map on the Nav display - I can see what I'm going to encounter.
Heated/cooled seats - the heat is obvious to anyone on a cold morning, but on a long drive, the cooling is nice, too.
Back-up camera and sensors - I really like that, particularly on the pick-up, where it's hard to see behind you.
Blind spot monitor - thought it superfluous, but they actually work.
Cross-traffic sensor - alerts you to crossing traffic within 75 feet when in reverse. Actually chirped once for a car I couldn't see and saved a potential conflict. Perfect for parking lots.
Full gauges - oil pressure, RPM, coolant temp, voltage (or amps, I'll take either)
What I have had before and wish I had now:
Oil temperature gauge
Transmission temperature gauge
Boost gauge (for the turbo cars)