~2000 Macs!!! Where do you work and how can I work there too?

The link you posted is correct. The note at the bottom of the page stating that client v2.1 can only be managed by admin v2.1 applies only to managing the client with the ARD admin software. Once the client is installed, VNC access can be turned on by opening the "Sharing" preference pane, selecting "Apple Remote Desktop", clicking the "Access Privileges" button to the right, and finally checking the box in the resulting window that reads "VNC viewers may control screen with password:". The ARD service must also be running.