Updating is a snap really.
Go to:
http://www.wowinterface.com/downloads/latest.php
It shows the things that have updated here recently. I believe CURSE has the same functionality.
Look through the things that have updated, update what you want, enjoy a smattering of new stuff that may have been released when you weren't looking, go on to gaming.
It doesn't take anywhere near as long as some people think. But people like to complain and whine whenever things change.
