I wipe hard drives utilizing Darik's Boot 'n Nuke (DBAN) utility, which can erase per DOD standards, but the "management" in my organization feels it necessary to physically destroy the hard drives. Try as I may to educate, my opinion and my influence is limited.
Case in point: Years back, I sent a hard drive to OnTrack Data Recovery with the hope of recovering some MS Word documents, after the drive had been re-imaged. Just being overwritten ONE TIME was sufficient to render the {partially} recovered documents useless.
My opinion is to recycle and reuse whenever possible. Hard drive data can be sufficiently scrubbed by software, and the economic payback is considerable as compared to the alternatives.