As an example, the second large expansion for the port of Rotterdam, Maasvlakte2, is at 6m above sea level. The previous one is at 5m. That added one meter has cost a few hundred million euro's extra, but money well spent in my opinion. The foundation of the Maasland Barrier is designed for a storm surge of 6m above mean sea level, even though the gate is currently at 5m above. Thats why it can easily be upgraded.
So even though not much is changing in the general publics perspective, for large infrastructure that takes 10 years to prepare and design, and is built to work for 50-100 years, taking into account (expected) climate change has been a necessity for many decades now.
On another note, here is a nice point cloud visualization of the entire country: http://ahn2.pointclouds.nl/