I don't differentiate between the two. I follow the same practices with my company systems as I do with home, family, and friends. I don't see a reason to treat them differently, nor your apparent objection to me doing so.
Let's say my in-laws do all of their finances, banking, etc online. Don't you think it benefits me to tell them yes, IE9 is safe to install, or no, it isn't, let me stop that from installing for you because it has some major issues? How about a family member who attends an online college?
If IE9 is pushed out through WU to all of these computers, they'll get it regardless if it has issues or not. If I get it first through a manual install process, I'm better prepared to say that it works fine or not...and better prepared to answer questions on how it works, where such and such option is, etc.