I've noticed a difference in the action "Attack to Location" and "Patrol to Location". Its not the fact that the units go back to their origanal location
,its how they attack units.
When you order the unit to "Attack" to a location they only attack major units (seige tanks, goliaths) but leaves smaller ones alone (marines, ghosts) until major threats are destroyed. When you issue the order "Patrol" to location the units attack everything and anything they see, including buildings.
Has anyone else noticed this too?
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Yes, there is a reason for that.
When the attack action was created it was created to attack a certain target, like you highlighted. Less-important targets are passed over when using the attack action.
The patrol action on the other hand was created to patrol over a large area to scout for enemy units of any kind. That is why when patrolling no structures are passed over and are dealt with.