bonch,
I have to say that I agree with you, though the new version of ScreenWriter (aka Movie Magic ScreenWriter) is actually pretty nice. It's currently in beta testing, and I am very happy with the improvements.
It's Mac and Win (originally Mac), though the Mac version if further along in the beta process. They will have a Universal Binary available when they release the new version later this year.
Here's a link for the current version (which is nowhere near as good as the next version). They have a free demo download:
ScreenWriter web site.
James B