For what it's worth, the company I work for (60,000+ employees) utilises (currently) a full desk encryption scheme that is software based. When a new laptop comes in, it take a full day to 'image' that machine to live in the corporate world, and a good deal of that time is setting up the hard drive.
The length of time, and resources required, is an acceptable cost to fully encrypted data for many many companies.
"Absence of evidence is not evidence of absence. - Carl Sagan