I suspect that a part of it is because planned features go in the same bugtracker, and there's no distinction, apart from in keywords. So "bug" in DW means "bug or upcoming enhancement", whereas in a lot of places, it just means "bug", so is less shiny.

Also, it's influenced by the number of people who've come from LJ, where bugs getting fixed happens very rarely from the user's point of view. So bugs actually getting fixed is "Wow, yay" rather than "That should have been done years ago", because we've already had all the "That should have been done years ago" and come out the other side resigned. 'Course, LJ does stuff behind the scenes, and there have been recent signs of improvement, but from the point of view of a lot of users, there are some bugs that have been untouched for years, that are now getting fixed on DW.