Instead of taking a train and bus 30+ minutes to work, I leave when I want and know it will take me around 15 minutes to get there. Maybe I'm weird, but I find driving a lot more relaxing than public transport (at the moment it's really hot here so AC helps). If I want to get groceries I can stop in a supermarket on my way home from work, instead of walking 15 minutes each way (bonus: it also has a bigger selection and cheaper prices).
If I want to get out of the city it's easy, I can drive for 20 minutes instead of taking trains and buses for 1 1/2 hours and I'm at the sea. Before if I wanted to do that I'd book a car from a rental place, go collect it, return it hoping I didn't get any scratches, where as now I can be spontaneous.
Having a car can be expensive (I estimate over the life of my car it'll cost me around €2000/year + fuel) but for the benefits it provides, to me that is a justifiable cost.