I think the "funnel your troops better" is a much bigger deal than you make out. You can use this to get hogs or balloons to run straight to key defenses.
If I've understood this right on a queen walk I could place the invisibility just right to hide the queen but leave some buildings visible. Making it possible for you to shield the queen from all damage and control which building she attacks next. I don't know how this works with the Champion's shield, but I guess you could use this to make her shield skip nearby defenses and take out some key defense deeper in the base. Obviously we need to try it 1st but I think this has huge utility.