But most people don't want to waste 90 minutes each way getting to somewhere that they could have parked up nearby by going in the car. It's not always as straightforward as just getting yourself there and back, as you may need to take bulky equipment with you. Say you like kayaking, are you really going to take your kayak, wetsuit and accessories with you on the bus and then walk with it for an hour to the lake?
Similarly, your local big supermarket might only be a 10-minute walk away, but how are you going to get a big trolley full of food home on foot? Yes, I know the answer will come that you can shop online and get it delivered; but this is your ONE option (other than a taxi - which is just an acceptance of your need of a car), whereas a driver with a car could freely choose either an online order and delivery OR to go and fetch it themselves, whenever they like with no notice (during opening hours!) and no slot to be booked or minimum order value, whichever works better for them.
Also, what about people who don't have capacity to walk/cycle all of that way - including the many who maybe did have capacity when younger and/or able-bodied (and they decided that they would never need to be able to drive) to reach and access these places, but don't any longer?
However much people like to argue to the contrary, a car brings you so many more options than not having a car. If the best/most convenient way to get to something is by public transport, drivers can use that instead of their cars; but on the many occasions when a car is the most convenient/only practical way of getting there, non-drivers can't suddenly decide to go in a car.
It's the same principal as people who choose to strictly follow a vegan diet: they naturally accept that they will have far fewer options available to them at a standard restaurant than would an omnivore - who may indeed really like the look of one of the few vegan options on the menu and choose it for themselves instead of a meat dish; but the reverse will not be the case.