I find the Epcot trees alone to be interesting and I know way less about trees than say @bebe80 .
Imagineers searched for local imitations of trees from Japan, or UK, that would tolerate the Florida climate. And there’s the forced perspective thing.
Other examples would be the painting Tower of Terror a color that would blend in with Morocco, because Tower of Terror is visable behind that pavilion.
There are other to do things. For many trips one family member or other would get a hair cut at Harmony Barber Shop in MK because tradition. We once went to the barber shop, at rope drop, for a “do” and then went to HS for the rest of the morning. I think most go for a hair do or a gel Mickey head.
Another MK thing is the Flag Retreat at 5 pm. I’ve never felt the least emotional for fireworks but tissue is a must at the Flag Retreat.
There’s the animation drawing at AK.
And we once spent 2 hours watching the Disney vet staff do a wellness check on a komodo dragon.
People watching is awesome - grab a libation, find a table and chill for awhile.
I love the model trains near Germany in Epcot and in the overhead in the Chester and Hester’s store in AK.