DS (2.5) has been going to nursery since he turned 1 for language development and social contact, 3 mornings a week. He loves going and is so happy to be there he forgets I exist as soon as he's through the door until pick up time. I give him a hug and kiss outside because I know what he's like and was just pleased he was so happy to go. When I went to collect him he'd come running over for big hugs, clearly happy to see me.
I've recently started language classes myself (we're not in the UK). This means he now goes every morning mon-fri. He still can't wait to get in but when I go to pick him up he cries. Full on weeping, end of the world crying as soon as he sees me. Why? Because he wants to stay. Being at nursery is obviously so much better than being with mummy :(