Wow I bet it feels different! I'm sure it's bittersweet, but I know that I would enjoy it. Then again my son is 18 months. I enjoy every little break he gives me, even if he's just sitting and eating his dinner.
My daughter went to UPK at 4, where she is now, and it's really amazing when they come home knowing things you didn't teach them.
Danielle, Nick, Gigi ('08) and William ('11)