I never like eclipse and hated all its problems.
Unfortunately Adobe decided to implement its editor over eclipse and also other nice editors, like fdt, used the eclipse framework to build their own editors.
I used Visual Studio for a while but that was enough to make me fall in love with it.
Visual Studio is indeed the best editor at all, without doubts!
Finally I discovered an interesting project for editing actionscript projects integrated into Visual Studio.
Amethyst is still in beta and probably too premature to be used in large production environment, but it’s a great news for me.
I hope they’ll continue in the development and create a serious competitor for Flash Builder.
For more info visit their product page: http://www.sapphiresteel.com/Amethyst-Product-Page