I was watching Wood Works today, and noted the lack of evidence of any other incomplete projects in David Mark's shop. Norm's shop seems to be the same way (but I don't claim to be an expert on that.)
Personally, I work on multiple projects at a time. While the glue dries on one project, I'm working on something else. I wonder, can the guys who do one project at a time get away with a smaller shop space? After they're done with their cuts and joinery, they can assemble the project and proceed to finishing, using the same work spaces for each phase. On the other hand, someone who works on multiple projects at a time would need space for each phase. After all, it's probably not a good idea to make more sawdust while the black paint is drying on the cherry.
Maybe instead of wishing for a larger shop, we should just do one project at a time to stretch the space we have.
Puckdropper