Adding here a sample image how I’d like the node graph to work for fast and comfortable use. Basic concept.
To connect nodes, user would pick OUT connection and hover on another node’s IN area to choose which input to connect. But would work also from IN to OUT.
EDIT: I add here also comparison of Vertical and Horizontal node setups screen space requirement to see that Horizontal layout takes double the space. But if someone likes it, then can do that way.