I think of an app like Photoshop, and it had one window for each image you had open, and then floating toolbars, another window for layers, etc. You could really organize your workspace and have a sense of "mise en place" in a way that doesn't really exist anymore.
Now every application is essentially a 16:9 rectangle squeezed into a tab. The web's enabled some amazing things, but not at zero cost…
Something's lost but something's gained, in living every day.
Everything seems to be at the point where you want to invite the developer over, get him drunk, and make him swear at his own product until he agrees the experience is not great. Of course there is no "the developer" anymore.
From my perspective the desktop metaphor UX was obsolete the moment it was conceived of. All anyone has to do is look at the physical desks of a thousand random people and it should be immediately obvious how little value there is in recreating that chaos.
Working with such few resources, an iPad-like fullscreen UI would have made more sense and been more efficient.
Companies just wanted to show off I guess.