This script replaces Maya's default ctrl+space behavior.  It  will restore your UI setup when you toggle between your default and full screen workspace.  If, for example, you enable the Range Slider in the full screen view and then toggle back to your default UI, the Range Slider will be restored the next time you toggle the full screen view.

It's a little thing, but it's useful.

How to Install

First, place this script in your scripts path.  Then open the Hotkey editor and in the User category create a new command named "myToggleUIVis".  In the command text field enter the following:

if (!`exists abToggleUIVis`) source abToggleUIVis.mel;
abToggleUIVis();

Click "Accept" and assign a hotkey to your new command (ctrl+space is the default behavior that it replaces).

And there you go.