FYI, KDE/Plasma supports all of those features you mentioned:
1. You can set the launcher/taskbar/panel to auto-hide.
2. You can set up the screen corners (or a keyboard shortcut) to show an Exposé-style view of all running applications/windows.
3. You can have a global menu bar.
1. You can set the launcher/taskbar/panel to auto-hide. 2. You can set up the screen corners (or a keyboard shortcut) to show an Exposé-style view of all running applications/windows. 3. You can have a global menu bar.