First off, wow, very bold assumption on your behalf as you do not know me.
Secondly, wow, very general assumption over a large swath of the enterprise.
Thirdly, I know IT types are sensitive to user leaning curves. In fact, I used to work at the hospital in my area doing data entry. The IT people there absolutely REFUSED to transition from xp to 7 because over the fact that Office 2007 caused a learning curve; even though that was years ago and people I know there have gotten used to and wouldn't go back to Office 2003.
Now, to say that going to the newest thing on the block isn't always value added, well, you don't say? If that were so, everyone would still be using xp and wouldn't be going to 7. If that were so, people would still be using Office 2003 and file based UIs instead of the Ribbon based versions. Enterprises will generally always do wave upgrades and do bits at a time over the course of a span of time as to minimize initial costs. Do you think it's really worth having to upgrade from xp to 7 in the enterprise? When the current systems and software are working fine, what's the point? If it involves an initial learning curve, some initial down time, and initial costs and downtime supporting the new OS, then why even do it?