OK I know this absolutely does not sound like what you’ve shared, but my go to band for crazy buildups is Godspeed You! Black Emperor. East Hastings's buildup gets me every time.
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Absolutely another recommendation for Godspeed You! Black Emperor.
If you like Neo-Krautrock, The Myrrors have a song Hasta LA Victoria that has a long, meditative build up that repeats, slowly layering in new effects and morphing until finally the drums properly kick in around the 6 and half minute mark (it's a 14 minute song (so on the shorter side for good Krautrock, haha!))
This might not be exactly what you're looking for, but Human Qualities by Explosions in the Sky has a pretty sudden increase in intensity near the end. It's not a slow and steady build up but you might still enjoy it.
+1 on the Coheed and Cambria recommendation.
I'd also recommend The Final Cut and In Keeping Secrets of Silent Earth as well.
The Final Cut ends with an amazing solo.
In Keeping Secrets is amazing the whole way through but the ending is something else.