I used to live in Belgium while biking to school in the Netherlands. Aside from the road conditions themselves, it was always very noticeable in terms of safety how much better the Dutch roads were. The second I'd cross the border, I'd go from badly maintained pavement with a roughly drawn on bike path to a dedicated biking road that runs alongside the main road with a ditch and trees in between.
I now live in Canada and while the road conditions here are definitely not as good, the thing I miss even more from Dutch roads is the traffic lights; they're all connected! You almost never run into a red light twice on the same road in the Netherlands. In Canada (and probably most other places) it seems almost guaranteed that if you hit one red light you're gonna hit them all..
And don't get me started on pedestrian traffic lights... :p