my thoughts would be somewhere "in the middle" of what jdcnow describes. Where I live right now, though, I am two miles away from any public transit of any kind, so that's not an option. By the time I reach a place where I can use transit, I'm already in the more-convenient car.
I envision being in a larger city with at least ordinary public transit. What helps, at least at this point, is that I love to walk. If I want to do anything "in town" that has a specific time (such as a symphony or a film event), I'd just go in early...and walk around up to the time. (If I don't give myself that cushion and I miss the bus, I could always change my plan and drive there.) If I want to go to a specific place that involves two or three buses and which is located somewhere that's easy to park in, I would probably drive. (As I type this, I keep imagining this scenario in Ann Arbor, perhaps coming in on a Jackson Avenue bus to downtown...or, probably considerably easier, driving if I'm instead going to Whole Foods...etc.) I would probably always drive if I'm getting a lot of groceries, etc. I wouldn't want to be without a car, though.
Bad or inclement or uncomfortable weather (which, believe me, my "example" of Ann Arbor is a place that KNOWS what awful weather is) would also tend me toward a preference for driving, unless I'm heading into a part of town it is simply too much of a challenge to park in.