Since GH2 is introducing a lot of new UI features, as well as breaking compatibility with existing add-ons, I’d like to mention a couple of features that I find extremely useful and that, at the moment, are perfectly solved by a couple of add-ons:
1 - Polyline wires
This display option - which is made avilable by the Riched Wires Types add-on (https://www.food4rhino.com/en/app/riched-wire-types) - allows to display wires as polylines.
Apart from the aesthetics - I find it cleaner and more attractive but this is subjective - this option makes much easier to follow the connections, especially for long wires and multiple wires starting from the same component - below is an example:
2 - Canvas Snapping
Right now this is solved very well by SnappingGecko (https://www.food4rhino.com/en/app/snappinggecko) which allows to easily align components based on their borders or the wire input/output points.
Both the add-ons work very well even with very large definitions.
Obviously the developers may decide to update them and make them compatible with GH2, however for now I just wanted to emphasize how these functionalities really make a difference in the organization and layout of the definitions, so maybe it would be worth considering the integration of similar functions natively into GH2.