DD was 1 when started creche 2 days a week and she was often tired enough to nap in the car on the way home.
As she's gotten older, that has lessened and now she is less tired than me after a work/creche day
I think the benefits of a good creche way outway the bad. I am in a situation where I often turn up at different times and am amazed at how much the carers do for the children, especially now she is in the 2 year old group.
benefits:
they are motivated and encouraged by the slighter older children doing a range of tasks
they learn to eat a range of food (AND see other kids happily eating new foods)
they develop confidence skills
they develop social skills, how to share and turn taking are vital
they see other kids toilet training
they learn to interact in a world where they manage their own friendships and fights over toys rather than having mums hovering over them and intervening (I REALLY struggle not to get involved in interactions!!)
they learn it's ok for mum to go away and come back
DD now runs to her carers for cuddles
Every carer in the place knows her, a great example was when she was sick a while ago with a hard to diagnose infection (she was a bit grumpier than normal) they ALL expressed concern that 'she just wasn't quite herself'. To me that reinforced their level of care and how well they all know her!
negatives
colds and coughs - well DD came back with a few chest infections and bad colds and a couple of viruses and I had to take time off work in the first 8 months especially. but since then she is robust and in good health (if she gets a cold now, it's a sniffle and has such a lessened impact on her day)
too much time away from mum and dad - that is one i would struggle with if she was in fulltime care. i am in a lucky position to work 3 days (2 days in her first year at creche) and one day is from home so i can pick her up earlier. But the girls at my work who have their little ones in full time care have wonderful bonds and relationships with their children, no different to anyone else. Some have chosen family day care and some day care centres.
One negative I find is communication with the carers as they do different shifts. It's a matter of my responsibility to ensure they hear what they need to hear. I have to manage my communication very well (I tell the person I need to tell face-to-face and put it in the communication book), but once they understand they fully cooperate.
The beginning is hard and i found it hard to trust other people with my child. But a lot of them are mums themselves and i learnt pretty quickly that most love children and their job.
Hope it all settles for you soon.