You're always wearing your company logo.
People talk to each other. Gossip still hurts.
Group efforts are more productive.
You may not be best friends with everyone, but be there when it counts.
Personal (and professional) development is important.
Whether or not you put your sorority experience on your resume is up to you. Heck, don't put it on your resume at all if you don't have space. But I think it's important to note that you didn't have to be in a leadership position to have relevant skills from your time in a sorority.