I understand both sides, I guess. When my 1st went off to kindergarten for the 1st time, I was excited, but I cried after I dropped him off. He'd never been away from me for so long before. I didn't cry when my 2nd or 3rd went to kindergarten for the 1st time- because I'd had experience with that already I guess.
Today he started his 1st day of middle school, and I am soooo excited for him. I'm also a little nervous because it's a new school and he only knows 1 boy (I didn't cry though-lol). It's an excellent school though, and I'm so excited about the new opportunities he will have- all the subjects he had before, but with more technology, art, music, and even drama.
So I guess it's the transition years with my 1st that cause me some anxiety. Other than that, I really do enjoy the start of a new school year :)