They don't address your stream comment, but one of my gripes is not being able to see repo counts when filtering, or having the option to fill in "repo descriptions" for older projects.
EDIT: I like the re-design and the fact Github is constantly evolving
https://github.com/skratchdot/github-repo-filter-info.user.j...
https://github.com/skratchdot/github-repo-counts.user.js/
https://github.com/skratchdot/github-get-missing-description...
They don't address your stream comment, but one of my gripes is not being able to see repo counts when filtering, or having the option to fill in "repo descriptions" for older projects.
EDIT: I like the re-design and the fact Github is constantly evolving