Sure there are major features that are dead on requirements for your purchase, like @sibhusky wanting a manual transmission to some people NEEDING 7 passenger seating or 10,000lb towing capacity for a travel trailer, that all make sense. But there are features that are "thow-in's" that turn out that are just nice to have. Our Jetta has a few of them like a 110v power inverter, this is just nice to have. On a long trip it is nice to be able to plug in the laptop or the iPad without the need for an external one that just takes up more space and more wires to get tangled up. The other neat little feature that made me think of this topic, a "Daylight Savings" setting in the clock. With this nifty little application, there is not having to reset the clock and roll through the numbers 2-3-4...11-12-1-2..damn..start over again..2-3-...Just click on the Daylight Savings button on the dash, it just changes the clock...in the spring..do it again. Just makes life just a bit easier and one less thing to deal with.
What little features that you have found on your car that does just that...make life just a bit easier?