This is s pretty huge deal, even on a cinema screen monitor. Initially, I thought the WordPress SEO columns were fantastic, but all the added columns really clutter the All POSTS/PAGES area. This is especially true if a person already has other plugins adding columns to these areas.
I have the "Reveal IDs" plugin (http://wordpress.org/extend/plugins/reveal-ids-for-wp-admin-25/) enabled, to show the IDs of all POSTS/PAGES and etc. This plugin added 1 column, with the numerical ID only.
Your plugin added 4 columns.
When I view All POSTS in full screen mode, on a 23 inch Apple Cinema Display, the "Title" and "Author" columns have already started bunching. So those with a smaller monitor and/or not viewing the page in full-screen, are simply presented with a garbled mess, in the "Title" column.
I suggest only adding the visual "Color" icon column and dropping all other columns. I would drop the remaining 3 columns in both All POSTS and All PAGES.
Your plugin is (and has been) very solid. You have done a fantastic job with its development and the support after release.
For visual people, like myself however, three of the additional columns added (), in the latest plugin version, are visually distracting and un-needed.