I used to teach reception (until I got fed up with the diktats of government and senior management, and escaped teaching with my sanity intact), and in my (many) years experience the parents are often much more upset than the children in the early days of school.
I'm relentlessly unsentimental, and I certainly never felt fragile when my children started school, but it seems many parents do, and I spent a lot of time reassuring parents (face to face, to those who needed it, no weird poems) that I really would look after their children, and treat them with kindness, and yes, even love. I think that's part of the job of a reception teacher.
And over the course of a year, I probably did grow to love them. They were not my children, but they were my class, and it was my job to fight their corner (in whole school terms), nurture them and care about them. Oh yes, and teach them too.
But I wouldn't personally have sent biscuits / teabags / poems - I've better things to spend my pay on, thank you.
But FFS, here's some poor sap of a teacher trying to do her best and care for the children and their families, and people are moaning about it. Find something worthwhile to complain about at least.