Having been ORD based at one point in my career I can sympathize with the craziness that occurs around there, however I would not heed this advice. It's one thing to keep moving after clearing the runway while the ground frequency is tied up, it is quite another to land without a clearance. With all the crossing runways and intersection departures going on at that airport your decision to land without a clearance could be your last.

Regardless of what anyone has told you, I would not land without a clearance.