The ceremony is over. You are married. The formal photos are done, You're at your reception and have already been introduced, had your fist dance, and you're finally getting a chance to sit down to eat something. At least so you thought. Back up on your feet and time to go greet all your guests and thank them for coming.
My advice, from a photography perspective, stick together. It's nice to have candid photos of the two of you and your family and friends. You can even do full table photos with each group. If you you go your own separate direction when greeting guests, you'll end up with a ton of photos of the two of you separately.