In fact, I would rather argue that the features on which intellij rules are of superficial nature and have more to do with a "nice feel" (such as more friendly code-completion or better looking graphics/colors).
But features that eclipse rules are more substantial (like performance, ability to work on wide range of projects).
The only reason that intellij appears to have more fanboys is that it doesn't come free. And its human nature that if you spend bucks on something, the free alternative will obviously look inferior to you!