Get another launcher, you have $25 credit from the Google Play store (also free launchers that can rotate the homescreen). The only app. that I have come across that doesn't take up the full screen real-estate is Speedtest.net, however, their iPad version does the same (lazy developer). It's all developers, the Nexus 7 boosted the Android tablet market, so we'll see better tablet apps. It's not to say the iPad doesn't have the same issue, it's what happens when you have phones/tablets running on the same platform.
The main screen doesn't rotate, most applications/screens in the OS don't take advantage of the extra real estate and just use the same interface they do on the phone version
Well, WP7.x doesn't support multi-core CPU's. We'll likely see that with WP8. iPhone 4s included too, in that comparison by the way, which does have a dual core CPU. The core UI is fully accelerated, and runs at 60 FPS (Project Butter). Well if apps weren't accelerated via GPU, you wouldn't have smooth playing games...See this link, and it refers to the Android developers blog, for more info.
Uh it has 1.3 GHz quad core CPU powering it, it better outperform the single core 1Ghz processors in trophy and iPhone 4. Is JB really completely accelerated? I thought only the core OS is while apps still have to do with CPU based rendering.