In my experience as a parent, volunteer and teacher, I have to say that parents have a much harder time than the children. We have taken "helicopter parenting" to a very high level, and if we pass that on, our kids get the feeling they cannot do anything on their own. But our job is to give them roots but also to give them wings! So we gotta let them fly!
The hard parts you and other posts have already identified - letting go, having them walk into the building alone, riding the bus alone, and parents not getting to chit chat with the teachers all the time. And 90% of the time, kids say that "recess was fun" and that's it. So we freak out because we don't know everything single thing they did.
The good news is, the schools are staffed with professionals and they just aren't going to let 400 parents in the building every day because absolutely nothing will get done. The children need to lean on their teachers and turn to them as educators as well as authority figures - there can be no structure, and no learning, if the place is full of parents. And kids will get the idea that they cannot function without parents there. We don't really want them to have that feeling, do we?
Also, learning to let go and not having a blow-by-blow report is good preparation for when they are teens, when they will tell you NOTHING!
Also, parents do not realize how much work goes into teaching - before your child arrives, and after your child leaves, that teacher is writing lesson plans and assessments, going over the children's work, preparing interesting displays, buying supplies (often with her own money), sending emails to parents who want to know how little Becky is doing, and dealing with learning disabilities and health challenges. She has to write emails to parents whose kids peed in their pants to be sure another change of clothes came in, and deal with some kid who just can't focus in a group because he's always had the TV or video game all to himself. A kindergarten teacher friend of mine has 6 kids with life-threatening allergies, one with bipolar disorder, 1 with ulcerative colitis, plus all the learning issues, autism and focus problems. She has kids who, when told it's time to sit on the rug for circle time, say "No way. I don't have to do what you say, and I'm going to the lego table."
So, I'd say that if you hear nothing, things are great! If your child tells you nothing, that's fine! You should get stuff in the backpack although more and more schools put stuff on line on a "virtual backpack".
As a teacher, I can tell you I just don't have time to talk to every parent to tell them what colors little Jacob used on his picture, who he played with or whether he finished his snack! I'd LIKE to do that, but I cannot.
You should get things ahead of time like info on lunch, snacks, bathroom breaks, etc. - teachers have done this before and they know parents need to know. But it's done in a group on orientation day or via email.
Try to be patient and really, you'll get the info you need in due time. Meantime, try to CELEBRATE this milestone in your child's life!
Parents who understand this, who support this, and who trust their parent enough that their child can function and separate well - those are the great parents!
