Whose workflows and at what point? Do we think the children born today will be satisfied with GNOME 2 (or GNOME 3 for that matter)? I agree that we're playing fast and loose with the definition of "reinvention" here (and that GNOME 3 is clearly not a reinvention of anything--to be fair, he started it!), but I think there's room for better than incremental improvements in all facets of computing, including the desktop.
People enjoy the idea of not having to sync their data because it's all "on the cloud" (eyeball roll) and because they have a 3G modem.
Sooner or later that enthusiasm will fizzle out.
For workflows I just think of some complex things I do that may end up being a 30-40 step process with tons of key presses and clicks. It's probably way more complex than it needs to be but I know it so well that I use the complexity to my advantage. So for example I know step 15 is a good spot to do a backup because step 16 might be a destructive process. The granularity this offers is so powerful. If I could replace it with a 10 step process I might lose the granularity. If I replace it with a new 30-40 step process it wouldn't really benefit me.