First of all, the article could perhaps be a little clearer. On G+ you have 4 separate areas at present. These are:
- Stream - where new posts from people in your circles come in
- Pictures - where you can see pics from people in your circles (pics also appear in the stream when first shared)
- Profile - where you can sort out your own profile and how the world+dog sees you
- Circles - where you can manage your circles.
Games is to be an additional area, and any game related information will be confined to the Games area - so you won't get farmville or vampire spam clogging up your stream - you'll have to go to the games tab to get it.
The other thing is that a lot of people are still waiting for an invite. I put an app on the google market that lets people submit an email address to request an invite and I've invited over 7,000 people to date. The app works through php (although all invites have to be sent manually due to google's t&cs) and anyone still needing an invite can request one by going to http://email@example.com - just replace firstname.lastname@example.org with your email address. You'll get one email straight away to confirm that I have your email address, and then you'll get an invite within 24 hours.
Alternately, grab the app from https://market.android.com/details?id=appinventor.ai_zelazny.Gplus_invite (there's also a paid version available, but I figured most people would want the free one).