Rather than destroying the safety features of all of your corded devices, perhaps instead you should simply be replacing those obsolete electrical outlets as need-be. A new outlet fixture costs about 0.79 each locally, or cheaper in bulk packs.

One purpose of the polarized 2-prong plugs is to allow devices that would otherwise have required a heavier 3-prong cord to use "double-insulated equivalency" construction along with the 2-prong plug.

The larger blade (that you've been destroying) is the neutral wire, and the smaller one is the hot wire.

If bunches of related equipment, say computers & attached (USB, Firewire, DVI-D, etc.. ) accessories, all use polarized wiring, then their PSU's will be in phase and maybe that means they'll have lower interference/emissions or some such thing -- pure speculation on my part.

Cheers