To be fair, the domestic parks do get their fair share of expansions...we just have them spread out over more parks so it makes it feel like less.
Between the TDS & Fantasyland projects in Tokyo, they received (or will) 7 new major additions (Soarin, Peter Pan, Frozen, Tangled, Tinkerbell, Beauty & the Beast, Space Mountain) since 2012 last major addition at TDR (Toy Story Mania, Inc.)
WDW received 12 new* major additions since 2012 (Little Mermaid, Seven Dwarfs, Tron, GOTG, Frozen*, Remy, Rise, Falcon, Slinky, Runaway*, Flight of Passage, Na'vi).
Hong Kong Disneyland received 7 (Grizzly, Mystic, Frozen, Toy Story, Ant Man, Iron Man) major attractions/min-lands... for a park that was severely underbuilt.
Disneyland Paris... not even worth analyzing with nothing major happening over there lol
Easy to forget, but the last major addition for Tokyo Disneyland before these expansions efforts to the resort was in 2009 with Monsters, Inc. dark ride. TDR just runs a lot of anniversary celebrations/new parades that makes it feel like they're constantly churning out things.