I don't see much difference there honestly. I still think going vertical is the key. Just a (simple?) matter of rearranging and resizing the existing controls.
Lots of wasted space here aside from the other issues.
With scroll bars this kind of routing window wouldn't have to grow at all. Have it show 3 of each as a maximum and scroll anything beyond that maybe, in sets of 3.
It just seems that the "horizontal fader" design for the routing window was just ultimately not a very good idea. Rotate some stuff 90 degrees and it's a whole 'nother ball game.