I don't deny that there are ways in which encryption can be very useful and that a very organized company can guard against ever losing their data because of a password mishap. I'm just saying I've never met one of these companies and I've done my fair share of consulting work for companies large and small,
People are used to security that can be circumvented if need be (through an administrators password or at worst a disk recovery service). When you're talking about hardware based encryption that option is no longer on the table and I think that rightfully makes a lot of people uncomfortable. In that way it's a huge risk.
Which is why things like bitblocker (again, built into Vista) don't get used.