hmm... with the PRV, and perhaps I'm mistaken, all those elements can be shown (or hidden) and color coded. Not sure how that would work in the staff view. It is however definitely easier to build up the intervals between the instruments with the staff view but I guess when working on that level the snap to scale feature scook mentioned could help.
For those with traditional training though (I'm self taught so my understanding/reliance of notation is a little... uh different) it would definitely be a bugger trying to work around it all. When I layer stuff it happens in my mind and then I translate it to whatever medium necessary and I'm used to guitar where it's easy to cram together all sots of whack intervals (only instruments easier are keyboard based). Traditional composition... yeah, I could definitely see needing the staff.
Again hopefully the ARA stuff might help introduce new possibilities... but I may be misunderstanding what ARA actually is (likely). I've seen the horror stories in regards to Rewiring notation editors into Sonar so I'm not particularly interested in trying it myself... for now.
What makes me curious though is if these fancy notation editors allow for the generation of MIDI files can't the composer just put the structure together, export it then drag it into Sonar to access the superior instruments? I mean... that's kind of how old school composing worked. Some madman scribbling away on parchment with access only to a piano (if he was lucky) and then handing it to the orchestra/conductor.
Meh.