The flying portion of Defying Gravity always moves me - especially the "It's me" moment I also loved the beginning of DRS when everyone was dancing and Lawrence comes out. I thought when Velma rises from the floor in "All That Jazz" was cool as well.
When I was younger and not into Broadway, I went to New York to see Seussical. We were walking through the streets, and I saw a poster for the Lion King and I said "Wow. That's still playing?" (I thought they performed it only a few times haha)