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.
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.
I mean, Joy to the World by Little Richard builds up to a hit that's like a freight train.
+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.
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