Is there an IDE out there that does structural syntax highlighting?

Question

Somewhat inspired by this question about a graphical programming environment. I don\'t think that C++ or C# are really conducive to this type of environment, but perhaps there\

Answer 1

There's also a free extension that at least draws the guide lines colored according to what they belong to. For instance, if guides in green and so on:

It's called StructureAdornment and you can get it in the Extension Manager or from the Visual Studio Gallery.

I find it quite handy.