I concur - no more ambient sections in general. The reasons I love ACOS and SDOIT as large, whole pieces is that they really flow together well, and there's a lot of great musical ideas.
"Octavarium" started with its ambient section, so I was OK with that, it set up some melodies and themes for the rest of the song, but it was still quite long, and even longer in live versions because JR used the intro to extend it into a solo.
"In The Presence Of Enemies" doesn't really had an ambient section, but it did use wind as a bridge between Parts 1 & 2. Thankfully I've merged the two parts in Audacity for a complete 25:12 version that should have been in the first place.
"The Count Of Tuscany" had an interesting effect for me in that this was recorded and released after the 10th Anniversary shows for LTE, and the influence of playing "Rhapsody In Blue" showed in their writing of the album's closing epic. The volume-swelling solo with keyboard accompaniment was similar to what LTE did in their Gershwin cover, so when BC&SL came out, it was a very happy surprise to hear something similar!!! This ambient section was also right before the closing segment of the song, and in my mind, serves as the perfect set-up for the ride out.
"Illumination Theory" is a bit of an odd one for me. It sort of feels like it just stops the song dead in its tracks, but the pick-up after its over is pretty awesome, and the song is just balls-to-the-wall from there on out. I'm still on the fence about the whole thing, but I think by now I like it a little more in terms of the song's structure. The ambient orchestral part itself is VERY beautiful, well composed and performed, but in context to the whole piece, it did feel out of place at first. It was shocking when I first heard it, mostly because it was REALLY unexpected.
At this point, if the boys in DT write another 18-25 minute epic piece, I think they'll try to work out some new ideas for form and structure, and perhaps avoid any sort of ambient section altogether. I'd like to see an approach akin to "The Gates Of Delirium" or "Awaken", rather than "2112", "Hemispheres" or "Close To The Edge".
-Marc.