The people put a date there that really means "Before this date it should be good in any case" (if not for example overheated in a cars window on summer etc..). Of course they dont put a date there so that theres a big risk that the film will be bad already a couple months before that (normally stored).
If you are going to shoot it before expiry date, you shouldnt need to put it in the freezer.
Both freezing and refrigeration slow down the film's normal deterioration, freezing just slows it down more.
In an ideal world, I would put stuff I intended to use x number years in the future in the freezer, otherwise the fridge is fine.
Expiration date is calculated for certain storage conditions. For b&w and amateur color films this usually means room temperature. Professional color films are expected to be stored in refrigerator. If you store your films in lower temperature it will last longer than manufacturer's expiration date. It will not last forever though.