I didn't mention it, but using the Grade Me block setup the way I mentioned will save a lot of navigation clicks. Instead of having to go to a course > activity > grade page > grade page for a student, you can get directly to the grading page for a student right from the Grade Me block by clicking the check mark that will be in front of their name. Then, since the block will also show on the grading page, you can jump directly to another student, if you need to.
Also, if you know how to program, it is pretty easy to create and add plugins for Grade Me that it doesn't presently have. Before I retired I had my own plugins for other graded activities such as the Journal and Podcast.