Eclipse immediately tells you what is broken when you change an api. IntelliJ does not.

You can't stop IntelliJ from saving work. I like to kick of a build, and work on some new stuff while it's going on without saving until the build completes. That workflow is impossible in IntelliJ. You have to down tools, for a long build with lots of tests that can make IntelliJ slower over all. IntelliJ generally more responsive for most work, but that's because it's not using Java's type system to find errors as you work, errors are deferred, which often means they take longer over all to fix.

Eclipse shows me all errors in whole project at once. This is biggest one. The hierarchy and callers hierarchy always work, I can rely on them way more then in Idea where they sometimes miss things.

Much much better full text search. I can search through multiple projects. Not just root.

Square selection.