I have to, as I don't have any 'wheels' at the moment. It's not so bad within the London area, as I have a 'Freedom Pass' that lets me use the Underground, the Overground railway system, the Docklands Light Railway or buses within the zone area (1-6) that would otherwise cost a small fortune (over 60's in London all get one, other cities or urban areas in the UK have schemes of their own).
Getting 'up North', say to York (where I go as often as funds allow) or Teesside (my own neck of the woods) costs a lot more than a tankful of fuel, about 1.5 times for a one-way trip, and I have to pay extra to get around within the area.
One big bugbear is having to listen to some people yatter away on their mobile phones (cellphones in the US/Canada). I had one yesterday who went on for a full ten minutes at the top of his voice. Another week at the bus stop another character went on for the half hour I had to wait.
Then there's the smelly foodstuffs some bring on buses/trains, and leave the wrappers lying around after they get off, or newspapers strewn all over the floor and seats.
Sometimes it would be preferable to live in Alaska or Siberia.