If you have the code:

object ContentAssist {
  val a: Thing = Thing1
  a match {
    case //<-- cursor is here
  }
}

sealed trait Thing
case object Thing1 extends Thing
case object Thing2 extends Thing

after typing "case [ctrl+space]", there are over 500 suggestions that pop up in the content assist window. However, you almost certainly want one of two possibilities: "Thing1" or "Thing2". This is particularly clear in the case of a sealed trait, but it also would apply if it were not a sealed trait, or if it were an Enumeration.
In this case, I think that "Thing1" and "Thing2" should be the only contents of the content assist window if you were to hit ctrl+space, but at the least they should be at the top of the list rather than just being sorted alphabetically.