We went on Easter Monday and there were lots of tourists, just like us.
Unfortunately the weather was overcast, but I can imagine that on a warm sunny day, this place is incredible.
All the same, we loved it. A very magical place, where you just need to sit, contemplate the view and relax. I suppose that the dune is so long that if you want more space to yourself, you can just take a walk to a part where not many people venture.
Be aware that there seems to be no public transport to the dune on a weekends. Hire a car if you need to; it’s worth it.