I agree too. And here's the relevant text from the rules:
"Also, if the Medic at any time finds herself in a city that contains cubes of a disease that has been cured, she may immediately remove all of those cubes. This unique ability is in effect during all players’ turns and does not cost any actions to perform."
Hahahaha well, I guess I should have turned to the instructions for this answer, but I appreciate everyone's help either way. Thanks very much.