We have a ton more parties and the majority are not religiously/fanatically opposed to each other. Also, they tend to shift over time, nobody battens down the hatches as the Democrats or the Republicans do. They have to be flexible to survive.
In the US one of the sides could start killing people in the street and they'd still end up in Congress...
What this means is that for many topics it's easier to reach consensus and the opposing party, now in power, is much more likely to continue a policy the general population likes.
