I just did a Mac comparison between CS5.5 and CS6 using a comp almost identical to the one in your example. Results seem about the same to me in both: full quality previews at full res redraw about once per second when rotating the camera. I don't have a Windows machine with me today to compare, sorry.
Your previews would draw much faster if you enabled OpenGL previews, Adaptive Resolution or Fast Preview mode. Make sure Depth of Field is turned off for previewing.
Hi Andrew, I tried with adaptive resolution, it's all pretty the same. I only get a normal result with wireframe only I also notice these layer wireframes around them (for selection or whatever). I have a feeling that also slows down ae. I thought turning off "Show Internal Wireframes" will actually turn them off, but it doesnt.
You'll have to get used to creating Ram Previews and using AE's interface in the right way. You should really go through the getting started materials on the home page and take a look at the FAQ. AE is a layer based pixel calculating beast that will do a lot more to a movie at 60 frames per second than Photoshop will do on to a still image. After Effects is essentially Photoshop for movies with a lot more options.
If you want to smoothly drag through the timeline and playback multiple cuts with simple transitions and two or three layers then use Premiere Pro. If you need to use 20 layers and 60 effects to create a stunning composite or motion graphics effect then you're stuck with rendering at just about any price point.