I’m struggling with the number of scenes too now.
This is what my scenes tab looks like:
Although scrolling through the scenes window is an option, it just isn’t as quick as using the tabs.
I might suggest that Sketchup developers do something like this:
Either the user manually groups scenes, or as is my preference, scenes are automatically grouped according to the scene name. So scenes with the same prefix, (text before a hyphen “-”) would be grouped together. For example, scenes with the names “Section-Big section” and “Section-Little one”, would be grouped in “Section”, and “Big section” and “Little one” would be shown when you click on the group.
I think automatic grouping according to prefix would be easier to implement for the devs too, as it wouldn’t involve adding a new kind of scene grouping data into the model structure (and creating a new API for it).
While you’re at it, maybe you could do the same thing with the Layers panel!