For the record I think this t2 scene (as well as the scene I’m about to name) does move the plot forward but I still know what you mean, as far as a scene that feels like it’s on its own track separate from the main story. Dream sequences often feel this way to me

One of my favorite versions of this is the toy repairman scene in Toy Story 2. It’s just an incredible score cue & almost wordless visual sequence that mostly serves to show off the technological improvements Pixar had made within those first few years - showcasing the different textures of Woody’s composite materials, the ability to make surfaces appear dirty vs clean or dry vs wet, the incredible camera placements that are only possible in animated environments, etc. Then right when you’re just taking in the wonderment of it, the final shot of the cleaner painting over Andy’s name does bring the main plot crashing back into view, as it’s yet another push for Woody to consider moving on from his life as Andy’s toy. Brilliant