Queen of Persia,
I understand that you feel that not driving is a more tznius way to behave. And perhaps in E”Y the situation is different. But I live in the northeast and if I didn’t drive, I wouldn’t be able to take my children to school, playdates, or doctor appointments. I would also not be able to shop for groceries or other necessities. All of these places are too far to walk (especially with little kids) and using a car service to get to them would be prohibitively expensive (not to mention dangerous, since most car services don’t have car seats). Bus service would be very expensive and most stores here don’t deliver.
I shop for clothing for myself about once a year. I don’t “window shop”, since I take at least a couple of kids with me almost everywhere I go, and they have little patience for window shopping. About once a month or so, I “eat” at a pizza shop or similar establishment with my children. (Actually, since I’m supervising my children I eat very little). So your examples about women who “window shop” or eat at restaurants don’t apply to me. And this is true of most of the frum women in my city.
Truly, my life would be easier if I didn’t drive, because then my husband would have to do all of these errands. But it would make his life much more difficult. My daughter has a classmate whose mother does not drive, so this girl needs to ask other people for rides instead. I don’t think she enjoys it that much.