The first thing I noticed was that I did not need to bring papers back and forth from school to grade. Most of the time I would bring them home to grade only to take them back to school because I did not get to them. It was a never ending battle. There were times that I didn't bring home the papers and had plenty of time to grade but didn't remember them. With Classroom, I was able to open my laptop and I could grade even while waiting in the lobby for an appointment. Super easy.
Another thing I liked was being able to see who did what on an assignment. I could check the revision history on group projects or look at the header for the student's name. No more work posted on the board with no name on it.
The third thing that I liked with Google Classroom was the ability to post links to assignments. This gave me the opportunity to use outside resources for students and just give them the link to find it. This eliminated the statement - how do you expect me to find it? question from students.
A fourth thing that was nice was that the sharing function was not necessary. This is something that I forget to do all the time and when students were turning in assignments, they would often forget to share with me. The turn it in function removes that obstacle.
The best thing that I noticed was the opportunity to give students feedback on their assignments as they were working on it. This created a conversation that I had with the students during the entire year. Diana Herrington gave me this thought that she felt was most important with her own students. The ability to have conversations with students. I feel that this really helped the most this past year.