I felt the exact same way, and due to moving and having 2 kids we went through a total of 4 preschools in 5 years.
I used to teach preschool and It seemed to me ( maybe it didn't to the paretns) but i would try to tell each parent a little something at pick up and drop off each day, and at least once a week or every other week share something unique to that child.
So, today we weighed a pumpkin, ask jillian to tell you who weighed more the pumpkin or mrs lilly.
and then once a week, ryan had so many stories to day to tell us about how he helps you weigh things when he goes grocery shopping with you.
As a mom, I was always looking for those little comments or remarks that let me know the teacher KNEW my child, Valued my child's contributions, and frankly enjoyed her own job. Those aren't the kind of things you get when you have to call up and request a conference. They are the spur of the moment things that happen each day and get noted and shared. It was never a 20 min conversation, and definitately if hte parent had a whiney infant, i wouldn't keep them, nor if they gave me an unfriendly hurried vibe.
But the first time mom's with the big smiles and friendly hellos. Yes, those were the ones I wanted to chat with and I would hope a truly excellent teacher would take a second every once in a while and do that.
unfortunately face time is more often spent with the parents of the more "ahem... challenging" chldren.
as to making friends with the parents. I for one expected it, Where else are you likely to hang around and have a common topic of converstation??? i would be much more likely to meet a friend at preschool drop off than at the grocery store or a dr's waiting room. But i will say, i can be pretty judgemental and if someone doesn't make eyecontact, or is busy talking on their cell, or yells at their kid for no reason, or doens't yell at their kid when there is a reason, I will tend to write them off and not make an effort.
if they make eyecontact and smile and seem to have similar parenting and general life styles, i will extend myself. but even then i still really protect my famliy time and hubby time and me time. So yeah i am busy.
and forget about the parents with older siblings they generally don't have room for a friendship with a parent of a younger sibling, unless they end up like a mentor. I am generalizing though i guess.
Bottom line, this is just how it is. Don't expect anything more at parent conferences, you'll probably get a very dry, johnny is an angel in class he can identify numbers, and knows these letter sounds, he shares and contributes to class, ..... and you will want to cry and say But who are his friends and what does he like best to play with and What do you love about him, but you can't really say that, because they would think you are crazy.
big hugs, If i ruled the world, this is one question that would never come up! because preschool would embrace the whole family in a cooperative endevor with the teacher.