I could be wrong, but I think Greame is talking about the concept of Pages to create an pseudonym for individuals, not for (small) companies. Apparently you can create a pseudonym on Google+ with Pages, but Pages are mainly marketed towards brands and companies [1], not individuals. It's confusing even for Google employees [2], let alone users.
A support page on YouTube tries to explain the difference between Google+ Profiles, Google+ Pages and Google Accounts [3]. But the fact that a Page can be managed by up to 50 different people suggests, at least to me, that the use of Pages to create and manage your pseudonym is more incidental than intentional.
I did successfully create a page. The problem was that it's still not clear to me how to keep identities separate.
I previously worked for a startup, and had a google apps account. It was impossible to convince Google that the account shouldn't have a Google+ profile, or that it should be the same profile as my personal profile.
And to date I'm still not sure if my page is a youtube account page, a page on my personal account page, or both.
I'm sure there are answers to these questions. I'd say most of my research time was spent making sure that the page wouldn't do something I didn't want it to do, because Google+ burned me repeatedly by unintended behavior.
Google also tends to make things permanent, such as the capitalization of my Youtube account channel. So it's not as simple as "follow the instructions on the page".
If you care about identity, you have to follow the instructions on the page AND make sure the instructions won't lead to something permanently wrong.
That is a good thing when creation of an anonymous account takes some time and/or proof-of-work. That limits spam while providing an opportunity for legit uses of anonymous accounts.
You literally need less than 10 minutes to create a Google+ page http://www.google.com/+/business/brands/get-started.html