Yeah, the bus came at a different time than in elementary school.
Instead of having a locker next to your home room, there was a massive labyrinth (so it seemed) of lockers down in the atrium, you had to find your locker, work your combination, shoulder to shoulder with kids you've never seen before (several elementary schools dumped into my middle school) and then try to cram all your supplies in there.
Then you had to wait in the lunch area, until the bell sounded, and everyone rose to their feet en masse and surged up the stairs to their homeroom, which you had to find for the first time ever. Once you got there, you were confronted by a whole bunch of really ugly students. Maybe it was just my homeroom, but they were pretty damn ugly. And frightening, because they were bigger than me.
Home room would last 15 pointless minutes, and then once again the bell would sound and everyone surged into the hallway. You had to find your next class, fighting against the throng. The whole day was regimented by bells (there were only a few bells in elementary school, one for start of class, one for recess, one for return from recess, and one for the end of the day. In middle school, there were like three per hour, each one signalling the beginning or end of a mad rush through packed hallways)
Each new class you would recieve a textbook, but you would be afraid to go down into the labyrinth of lockers to drop them off because you might miss the bell. So you would walk through the school carrying a stack of books. Older students would delight in slapping the top of your pile of books, causing you to drop them. When you bent to pick them up, other students would bump into you and swear at you, as you caused a massive snarl in the packed hallway.
There seemed to be no logic to the layout of the school. You'd have to traverse the school several times during the day, alternating between windowless, interior rooms, to overheated exterior rooms. There was no place to go for quiet; even the library was just a platform with packed hallways on all sides, overlooking the clamorous labyrinth of lockers.
Needless to say, I did not enjoy my first day of middle school, or any day of it. I still remember quite vividly after nearly 20 years. It was in middle school that I began having my first day of school nightmares. Even when I was in college, working on my masters degree, the night before the first day of classes, I would relive my first day of middle school, with all the additional anxieties of high school and college piled on top of them. I wonder if I will have them again if I go back for a PhD.