El Capitan: You can now hide your menu bar

In OS X El Capitan, due out this fall and now in public beta, you can hide your Mac’s menu bar. Look in System Preferences > General for the option. If you also hide your Dock (from System Preferences > Dock), like I have below, you can get a pretty unobstructed view of your multi-window workspace without resorting to full-screening single apps.