I think the ability to run Windows applications was more of a psychological than practical advantage, particularly with the growth of web applications. VirtualPC ran pretty well on PowerPC for limited/occasional use (personal experience). With the exception of some (so-called) Web applications that require Active X controls (the worst offender being the S/MIME PKI module for Exchange WebMail), I haven't had to either BootCamp or VMWare/Parallels for the last 2-3 years.
That being said, many companies (my current employer included) continue to be a Windows-only world, arguing cost efficiencies (and ignoring the investment in keeping Windows secure.) I worked around a problem with their corporate SharePoint by setting the Safari User Agent string to Firefox