Things I Miss From Pre-2.7

The ability to actually USE both the visual editor and the HTML editor.

The Image Upload Wizard.

The ability to add new categories on the fly, right from the post edit screen.

The ability to see possibly matching tags as I typed in a tag name on the post edit screen, and then simply select an existing tag from the “match list”.

The list of already-selected tags underneath the tag entry box, with the ability to start with an empty tag entry box for each tag; and the ability to simply click the “x” next to a tag to delete it from the post.

The ability to manually edit the Permalink for a post (clicking “Edit” button does nothing).

And that’s just from my first 2.7 post.