This week I started using Herdr also, and while I don't yet have it setup as I'd want, it's slightly better than me previous pure tmux setup to manage multiple agents. I also always turn on remote control on claude so I can control it via the app.
I suspect the gas towns and similar are no longer a necessity: I think as the models get better, the organization structures need less attention. I've been doing fine with, for each project, spinning up just one manager to manage all the relevant sessions and ping me when I'm needed. Or if I want to be hands off I get a pm and a tech lead claude sessions up, and the pm moves the work forward while the tech lead makes decisions on what to work on next and how to tackle it. This is in spirit a similar thing to gas town, but incredibly simplified. I don't think this would work with claude 3.5, but with 5.5 I'm quite happy!