New day, new app in Cydia: SBSimplify. SBSimplify allows you to hide and show the Dock and StatusBar, and automatically respaces your icons with a nice little animation.
Once installed, you will find a new option in Settings. You can activate the tweak with a button and the result will be immediately visible on the SpringBoard.
SBSimplify is available in Cydia Store via BigBoss repo for $.99