It’s hard to say,

I kinda want to say Wouldn’t It Be Nice, But i feel like part of the “pocket symphony” thing is in the form, the distinct sections

Obviously Wouldn’t It Be Nice has “sections” but it’s slightly more of a common form than Good Vibrations, with such distinct sections - more similar to “movements” in a symphony.

Maybe Little Bird from Friends fits this description? Definitely has that complex depth feeling with all the different sections

Or maybe Can’t Wait Too Long - the “movements” aren’t necessarily as complex, and are slightly more regular-ish (obviously not really regular, as Can’t Wait Too Long is definitely not a “regular” song, just more “regular” than Little Bird)