Authoring or editing?  Two different things.

 

For movie editing etc I use Ulead Media Studio Pro.  I found it almost immediately intuitive, but I have analog video editing experience so that might color my opinion.  But I let my neighbor edit something on her own on it and she picked it up right away after a few pointers.

 

For authoring I've been using Adobe Encore.  It's a little monsterous but I found it gave me absolute and total control over the DVD menu system, etc.  I originally tried it because it allowed subtitles and multiple audio tracks but when I abandoned those ideas for my project I stuck with it.  It can take a long time to get things right, I've found, while some other more wizard based programs like Ulead DVD Workshop are quick and easy. You just don't have the control you might like.

 

HTH

 

-paul