Brussels cycling infrastructure has improved a _lot_ in the last decade and the number of cyclists is growing every year while the number of households with a car is decreasing every year (less than half of the househols have a car now).

As they say, there's no such thing as bad weather, only bad clothing. The weather in the Netherlands is not very different and it doesn't stop them.

Also the public transportation is by far the best of the country, but that doesn't say a lot.