Interesting query indeed... of course I have no clue how C&C choose to do things or how they think - I rely on Tom Paul for info about that - nor do I care about any architect or favor one over the other at all - but the evidence is there that C&C don't like side by side golf holes. I've played Kapalua Plantation, Cuscowilla, Bandon Trails and Sand Hills and I can only think of one instance where this happens: 14/15 Sand Hills. Maybe I am missing some others?
The thing is though, it's not like any of these courses is lacking in any of the things Dave finds charming, that is:
"other beautiful holes sometimes make a nice backdrop; the glimpse of distance golfers can heighten the experience; common areas can really contribute to the connectedness, linking the links, creating and confirming the courses personality."
One can and does experience these things at each of the four C&C courses I've played - particularly Sand Hills. You can't see or feel or hear golfers RIGHT NEXT to you, but you surely can see them off in the distance... and each hole is always very well linked to the next...the next tee is generally right there, within sight of the previous green, or the path to it is very clear... the sense of "journey" is done very well.
So no, I'd say they don't overdo the use of insulated corridors, because in each case they really aren't all that insulated. C&C seems to pull off a very neat trick of achieving a tranquility on their courses, while still keeping them connected as Dave likes. Hard to believe as these two things would seem to be mutually exclusive, but it's true... And that's among the many reasons why these courses are so truly great.
TH