Personally, when not being a tourist, almost all my trips are home to some place and back again.

Public transport is great, but if you're going to a less good part of the city, or even just a place that's unfamiliar, and less frequented, it might be a bit more difficult to get around.

And public transport travel distances can be patchy based on where the stops are, especially if you're going to the outskirts of your city.

Also when having to be present in the office, that extra 15-25 mins (x2) it takes to get to and from the office adds up quickly.