Thanks to those taking the time to post some responses on this question.
I found Tobia's suggestion to map a wrapping toggle onto a function key extremely helpful - thanks, i'm using it now. Sometimes the simple ones are the best :-) I've also investigating folding a bit more thoroughly in the vim context and that has helped too. Conceal sounds like a good patch I will look into that when my deadlines get a bit easier, I don't really want to start trying to break my environment or getting distracted recompiling at this point, maybe in a few weeks. Cheers, Howard