Just to add my different workflow to the thread:
I personnally hardly use sketchbook.
It’s just the place where I would save quick drafts (for instance for forum debugs, like you mentionned).
But as soon as I want to later get back to it, or just keep it safely, I would from the start put it inside my usual work folders, either on synced drives (Dropbox or the likes) or Git.
Though, I share the essence of your intention in that a quick access to “hot work folders” could be handy. Maybe being able to favorite these folders, like you would favorite repos or create workspaces (group of favorites) in GitKraken for instance? Workspaces are super handy for instance because in one-click you can open all repos in different tabs.
The notion of workspace in vvvv with a list of fav files that you can open all at once would be a real time saver.
For instance: you currently work on SecretProject_ROOT.vl, but are always working inside your MySuperDuperLib1.vl and MySuperDuperLib2.vl.
If you create a “SecretProjet” workspace and add these three files, “opening the workspace” would open the three .vl files all at once.
This saves a ton of time when you often switch projects and would like to have this feel of “resuming where you left off”.
Also, maybe I would find this feature more relevant to a launcher/dashboard (like in UE, Notch, etc.) and thus wonder if I’d not rather think of it as another are in Gamma Launcher than on vvvv itself, to keep the latter as vanilla as possible (for instance, in on-site deployments, I wouldn’t want to have an annoying splash app launcher by default like with all these other apps).
That’s why I like Gamma Launcher so much: a great (almost mandatory imho) comfort help for your dev workflow, but that you have the option to not use when deploying your app on site, where you would just usually embed your startup setting in a .bat.
I think this is a very interesting conversation though, as it seems UX / Quality of Life is a hot and very active topic these days.
So thank for feeding the think tank with this topic with these thoughts and would be curious to read others adding their own!