Earlier quoted context omitted.
Dunno to be honest. I've become a bit cynical because for the last decade or so people have claimed that there are good FOSS editors, then when you try and use them they fall apart at the first opportunity. Blender's the only NLE I've found that's not comically flaky. It's possible Kdenlive really has improved though.
How many NLE software packages have you used? I find it interesting that it seems that for a some people, Blender is their first experience with a node-based editor. They've been around for years. While I haven't used Nuke (or Shake), I was very good with Houdini for CG which is all based around nodes. It does include some basic compositing (or at least it did the last time I used it).
The other big node-based thing is audio synthesis / effects, for example Pure Data. As far as I know these are the only areas where dataflow programming has really taken off.