It depends heavily on what kind of winter you have, really.
I'm in Stockholm and currently we get temperatures approximately between 5 C and -5 C, with some amount of snow/ice/slush being an expected feature on the roads. I still commute on days where conditions aren't too terrible, but using my dedicated winter bike (a.k.a my old bike). I use studded tyres on this bike.
Since I'm just commuting, I get by with using my regular winter clothes (hoodie, jacket, warmer shoes) and the only clothing I add are very thick gloves. My hands are one of the few places on my body that is very susceptible to the cold, so I have to protect them well.
Under these conditions, I don't do long recreational rides. It's just not fun, and that's fine - these will come back once the weather improves, probably in March.
Instead, I do occasional sessions of zone 2 rides on an indoor bike at my gym, trying to do between 1 and 2 hours. It's freakishly boring, but it is what it is. I get some podcast listening done at least.