I grew up in a region with fairly mediocre transit, but because the living environment is not hostile most things can easily be done by bike unless you need to go to another city. Hell, I biked 8km to school, and while somewhat time consuming it was quite literally free exercise.
When I went to uni, before moving to that city I relied on transit. Because of the low density in the region, trains are only half-hourly (which is by far the most sucky part) and it's on single-track rails so every train stops at all stations. However during rush hour it's still time-competitive with cars, and transfers are generally pretty good because those are the reason transit works in that region at all.
Something like "you need a car to be able to get to (store)" that's mentioned in another comment would be literally unthinkable here. You can get practically anywhere with a bike and a transit card.