When you think about it, Logos toolbar, menu bar, resource toolbar, locator bar, etc. all take about 15% of vertical real estate of the screen. With the introduction of a simple 1 key stroke, users can toggle all these various bars.
For example, turn this:

into this

by simply pressing `(key before 1) for example.
This would be very effective for “reading mode” when one does not need command window or various shortcut icons, etc.
when "`" is pressed the first time, EVERYTHING, but the content disappears,
press "`" again, and you get the locator bar
,
press "`" again and you get
,
press "`" again and you get
.
What do you think?