I'm coming from a Galaxy S3, so this is my first Nexus phone. I used to have groups on my phone contacts. Was that a touch-wiz feature?
Do: Menu > Contacts to display > Customize. There you can set a custom view of selected contact groups for each account. Not a perfect solution, but close enough for what I need.It's not well-implemented in stock Android. In the Contacts app, tap Menu>Contacts to Display. You can select there which groups to display. There is unfortunately no way to sort all contacts via contact group in the app.