My favorites here - I'd recommend listening to the whole songs for maximum effect

Ne Obliviscaris - Devour Me, Colossus Pt. 1 Blackholes Small build-up in an acoustic part starts at 7.16 and right where the lyrics go "my world in bloom" the song explodes, and then come the growls with some of my favorite lyrics ever. Total eargasm.

The Ocean - Hadopelagic II - Let Them Believe There's a build-up starting with "Change is what scares us shitless" and then the second chorus right through the end is just glorious, climax hits at 8:36 with "and let them live with their contradictions".

Tesseract - Cages The song starts out pretty chill and atmospheric and builds in heaviness through the end. Specifically, at 4.08 starts the final build-up, gradually taking out the synths in the background and ending with Dan's screaming.

Ihlo - Hollow The whole song is pretty quite chill but building up slowly and at 3.21 is this gorgeous chill inducing moment.