The worship space sets the stage for worship.  It creates a mood, an atmosphere.  It helps the participant leave the mundane world of everyday life for a moment and enter into a place where they can focus on larger issues.  It allows them to put themselves and things into perspective as they connect to something larger than themselves.  Setting the stage doesn't do the work for the worshiper, it just gives them a little boost and reminds them that that's why they're there.