Thanks for sharing this video! The new graph view really f…ing rocks! 
However, have you already realized the partially different filtering options of the “local graph”? There you can additionally filter by “Incoming” and “outgoing” links and it allows you to chose the depth of connections shown in the graph (only show direct links; show second level linkings, and so on).
The local graph with its filtering options actually comes close to my feature request here - if there could be a further filtering option in the (local) graph view for showing notes related by tags instead of links, that would possibly even be the much cooler solution than the one I was thinking about! 