On corporate installs the number of former employees can easily rival current ones. The results in the "All" view for the People app showing a lot of noise. Create a new "Active" query showing non-disabled users, and make that the default.

On an install with disabled users:

• Go to /people/ and see the nice highlight for "Active".
• Look at the results and verify that none of them are disabled.
• Click on "All" and verify disabled users are still there.
• Explicitly click on "Active" and see that it's no different than default.