In our very first iteration we had a node based system integrated but after testing it and playing around with it we quickly realized that a node based approach is not a good solution if it comes to create terrains - the current layer based system proofed to be more easy to understand and quickly to navigate - actually all our customers say that World Creator is by far more easy to use than any other terrain generator they own.
So we kept our layer based system and if you look at the few videos we have you can see that it is really easy and straight forward- When we used nodes, it was like “finding the proper node among 80 and more nodes” - actually the whole terrain design got stucked just because all our testers got lost between all the nodes - same when trying to find the proper node that you need to achieve a specific goal.
But nodes are still very powerful - look at our other tool called ShaderTool. Here it really makes sense :). So this was our experience with nodes so far - maybe we will integrate the possibility to switch betweek layers and nodes then propably everybody gets happy 