New Ctrl+Click behaviour

As we all know from the release highlights there is supposedly a new ctrl+click attack feature introduced. NEW! > Ctrl+right click can be used to attack a target, ignoring any retargeting command. A unit will only retarget if:

They cannot path to the target object.
The target has been killed.
The target has moved out of range.

I tried attacking with ctrl+right clicking and with simply right+clicking but couldn{t notice any difference.
Can someone please explain any specific situations when the difference would be apparent?