The admin UI for navigating between various posts and pages is cumbersome. You can't easily get back to recent posts or pages you've edited. Instead you have to pull up all posts or all pages and find the ones you want.
A typical use-case would be to pull up a page to grab some content from it and switch to another page you were just editing to paste it in.
I would like to see the core Admin panel have options to pull up a list of recent posts and pages to go directly into editing them.