Bad analogy. Hondas don't have 500 high-risk security issues. They also don't take your friends to the wrong houses. Unlike Crapdroid and it's "Oops, your text went to the wrong person" issues. Your analogy makes Honda sad.
More like putting a Flinstone mobile mask on a Ferrari.
If you sit there and stare at the wallpaper for a long time, they could. Otherwise, no. You can probably count most people's total daily homescreen viewing in just minutes. On, swipe to screen, pick app, done. Think of how long you really look at the iPhone homescreens.
Likewise, don't the visual effects moving between screens on most smartphones eat up extra battery? Sure, but they're worth it for the fun and visual feedback.