Android is based on Linux. Both Linux and Android allow you to change the entire user interface if you want to. In Linux you install a different "desktop" (Gnome, KDE, X11, etc.). A couple of them are nearly perfect copies of Windows and there's even one that looks a lot like the Mac OS.
You can do the same thing with Android by changing the "launcher". The default launcher (home screen) you see is a little bit annoying. But I guess it's the price you pay for a "free" toy.
Not to worry, you can simply change it. The easiest way to do that is to search for "launcher" in the Google Play Store. If you still have the default launcher installed in Bluestacks, just click the big magnifying glass at the left (?) end of the top row. That should pop up the Play Store and let you search for "launcher". There are a ton of different ones and many are freebies.
Clicking on the big magnifying glass launches the Google Play app. With the default Bluestacks launcher it seems to be the only way to get to the Google Play app.
There are actually lots more of the standard apps preinstalled in Bluestacks but you won't be able to find them with the default launcher.
I'm currently using "ICS Launcher". As you might guess from the name it gives me the look and behaviour of the stock Ice Cream Sandwich launcher. I'll probably play around with some others but first I wanted an interface that gave me a more familiar starting point so I could see what I was really working with. The default Bluestacks launcher doesn't do that. It's mainly a big advertising screen.
You can see (and install) ICS Launcher here: https://play.google.com/store/apps/details?id=mobi.SyndicateApps.ICSv2
Just poke that into the browser in Bluestacks and it will take you to the appropriate item in the Play Store. Once you are at the Google Play Store in the browser you can do anything you might do with the Google Play app.
After you install a new launcher you will be able to better see what all is preinstalled in Bluestacks already so you don't have to duplicate it.
Hope that helps a bit. I felt like I was flying blind until I changed the launcher. Once I got the launcher changed to a more familiar interface I was off and running.
Your right, Malaki ... pretty freakin' cool!!