I wholeheartedly agree and would dearly love to get back the long, long hours wasted in pulling grades together. What you say of editing grades is equally true of reporting grades - also very important from the perspective of evaluation and learning.
It is frustrating that something so useful and probably so commonly required in a wide range of educational contexts is still not covered by such a mature LN as Moodle. Grade reporting for different types of users - the student, the teacher, peers, mentors, parents etc - is glitchy and cumbersome to say the least, even in 2.6. The plugin "Site-wide user report" partially addresses the issue of institutional reporting. This allows students and teachers to see grades from multiple courses on a single page without having to leave and enter the individual courses. It also allows you to select the courses for which you want to see grades. However, I have to add that it is still very cumbersome, time-consuming and limited in comparison to other reporting environments.
Because the reporting is, amazingly, still so difficult to administer in Moodle, as an organization we decided to move out all grading and administer it elsewhere. We export all grades from whole Moodle sites directly from the MySQL database (with a fairly complex query I have to say) and store them in a data warehouse. We then use a third-party Reporting Services environment to easily (in comparison to Moodle) produce a wide range of reports of all shapes and sizes all available from a web server. In the end it saves us a lot of work, especially on help desk calls and keeps students and teachers much happier. Teachers still use the gradebook to input all grades across the whole site but all reporting is administered externally. The site-wide user report download is at: