Huh?? I don't have a car, and I have almost run my stroller into the ground--I can put MILES on that thing in a week. Never used it much until ds was older, though--I can't stand seeing people with newborns and all the contraptions. I take the bus a lot and it's almost comical, seeing people struggle with their big awkward plastic wheeled thing to carry around an...8-pound infant, who would take up less room than their tote bags without it.
I almost never use it for casual strolling--it's always functional. Taking ds to preschool (10 mins on bus plus half mile walk), going grocery shopping, walking the dog, walking to the big park about a half-mile away...
I am one of those people with an older kid in a stroller--he's almost 4 now. Yes indeed, he can walk, and often does--but when I have to be somewhere with him on time, I just can't always spend the extra 45 minutes to go 3 blocks that it would take. And in the stroller he can read, he can have a snack, and I have a handy cart for grocery shopping, to hang my bag full of books on, etc. Frankly, I will be sad when he no longer fits in there, and that day is coming soon. (I do often now stroll him without seatbelt, and he can get up and run or walk for a while if he wants and then sit down again.)
Plus, when he falls asleep--the stroller is a lifesaver. YOU try carrying a sleeping 3-year-old and a heavy backpack from the subway onto a bus and then another 2 blocks home without a stroller... (I did it once, though!)
I think strollers are definitely more natural than cars too--we go out in the rain, the snow--my son definitely knows what weather is. (He actually LIKES to get rained on, he says...) My old MacLaren is rusty, has bald tires---it's still going strong. It's been good exercise for me, too.