In a pure Windows 2000 environment, you don't need WINS. In fact, I would recommend that you avoid WINS if possible. However, if you have pre-Windows 2000 clients, then you will need WINS because only Windows 2000 onward can use only DNS for name resolution.
I've got a bunch of Win95/98 machines on a Win2K-servered/DDNS LAN with no WINS and they work. Or am I reading too much into that statement?
I'll go read up/investigate some more.