Ignoring the fact that it's winter in some parts of the world, I think there's a simple explanation. Summer is probably when people are doing the most bicycling, and people have a tendency to write about what's on their mind.

I think the OP meant to make a quip about the relative unpleasantness of a bicycle commute in the winter.

In Denmark, it's not so bad actually. While winters tend to be miserable in their dark grayness, they're rarely very cold. The risk of rain is higher, but any day throughout the year could be wet. In other words, with a bit of gearing up, especially with a shower at your destination, year-round bike commuting in Denmark is completely feasible.

Not that cycling in freezing rain doesn't objectively suck.

I'd rather have "very cold" than "above freezing, but wet". If it's well below freezing it's easy to stay dry due to water's tendency to stay solid. And if you're dry, it's much easier to regulate your internal temperature.

Of course, salted roads can give you the worst of both worlds: wet & very cold.

If one finds it pleasant to ride in the summer, but not in the winter, they can always just ride in the summer.

Come to Vancouver - we have the same rain but with hills and N American drivers.

I'm an intern in the Seattle area for the summer and was faced with a choice upon arriving - buy a bike and get $350 of it covered or pay ~$1000 to get a rental car for all three months. Due to the obvious financial benefit of the former I wanted a bike, but after it raining for a week straight upon my arrival I chose to get a car. This, along with the tremendous social benefits of being able to come and go as you please, convinced me that owning and riding a bike is a healthy alternate transportation method for the nice days, but not really a feasible replacement.

I have spent the last two years at university cycling to lecture and am now cycling to work. It saves a large amount of money (~£1800 insurance+£1500 running costs). If it rains you just wear waterproof clothing. You can easily get good quality waterproofs (e.g. Gore-Tex) for £200 which will last for years.

You have to be willing to live fairly near to work of course. For me it would probably take about the same amount of time to drive to work. It takes me about 13 minutes to cycle and rush hour traffic will slow a car down.

If I want to go longer distances I can catch a train (and take the bike for the other end) or take a bus. Occasionally hiring a car is also possible for rare occasions.

So for me using a bike is completely feasible for living in a city.

I'm from Vancouver Island(right near seattle) and bike through the winter. It really isn't that bad when it's raining, wear a jacket. The only days I don't bike are snow days(because they don't do snow removal very well here) and then I take the bus.

Well, the OP is about Copenhagen, Denmark. It is not exactly warn and sunny here.