Well, let's see. In the last 5 years the new attraction count has been - not including parades and fireworks:
WDW:
Philharmagic
Stitch Encounter
the upcoming Laugh Floor
Pooh Playground (yuk)
Upgrade of PotC
Leota Tombstone added to HM
Mission Space
Finding Nemo Dark Ride
Soarin'
Another refit of Imagination
New China Film
New Canada Film on the way
Update of El Rio Del Tiempo
Lights, Motors, Action
Midway Mania
Everest
The attractions of Dinorama
DL:
50th film for DL,
Upgrades/Refurb to Jungle Cruise, PotC, HM, Space Mountain, the Subs
Many Adventures of Winnie the Pooh
Buzz
Bugs Land
Tower of Terror
Monster's Inc
Midway Mania
TDL:
Monster's Inc Attraction
Buzz
Winnie the Pooh Hunny Hunt
HM Holiday
Tower of Terror
Raging Spirits
DLP:
Buzz
Spacemountain Mission 2
Turtletwister
Cars Race Rally
Cyberspace Mountain
Stitch Encounter
Tower of Terror
HKDL post opening:
Fountain play area
Autopia
Stitch Encounter
Animation attraction
It's a Small World
Rumoured PotC
Now who is missing out? Come on, WDW has more money spent on it than any other.
Your list is very biased to prove your own point. Now I don't keep up with the international parks enough to know every little refurbishment similar to some of the ones you are listing for WDW (new tombstone at HM? Gimme a break), so here's a more complete comparison of the last five years at WDW and DL
WDW:
1) Mickey's PhilharMagic
2) Stitch Encounter
3) Monsters Inc. Laugh Floor Comedy Club
4) Pooh's Play Place
5) Upgrade of PotC
6) Leota Tombstone added to HM
7) Mission: SPACE
8) The Seas with Nemo and Friends
9) Turtle Talk with Crush
10) Soarin'
11) Journey into Imagination with Figment!
12) New China Film
13) New Canada Film on the way
14) Update of El Rio Del Tiempo
15) Lights, Motors, Action
16) Midway Mania
17) Expedition Everest
18) The attractions of Dinorama
19) Finding Nemo the Musical
20) Wishes
21) HSM show
DL:
1) 50th film for DL,
2) Jungle Cruise upgrade
3) PotC upgrade
4) HM upgrades
5) Space Mountain upgrade
6) Finding Nemo Submarine Voyage
7) Many Adventures of Winnie the Pooh
8) Buzz
9) Bugs Land
10) Tower of Terror
11) Monster's Inc
12) Midway Mania
13) Turtle Talk with Crush
14) Show with Mushu at Animation
15) Aladdin: A Musical Spectacular
16) Snow White (gone now, though)
17) New Cars Test Track ride on the way
18) Remember...Dreams Come True
19) Tiki Room upgrade (cleaned up and the changes to the outside at least on par with a new tombstone at the HM...)
20) "it's a small world" upgrade
21) Playhouse Disney: Live on Stage
22) Parade of Dreams
23) Block Party Bash
24) HSM show
25) New show on the way for Paradise Bay
26) Rockin' California Screamin'
27) Rockin' Space Mountain
28) Complete remodel of Tomorrowland including return of Tomorrowland Terrace
29) New train for Disneyland Railroad (Ward Kimball)
...and I'm not even going to include the 50th repainting of the castle, all the golden 50s, photo mosaics, golden vehicles, new logs on Splash, major renovations at the Matterhorn, the new monorail trains on the way...
Now I won't pretend that all of the stuff listed for either park is particularly worthwhile...some of it's actually pretty crappy, but I tried to include the good and the bad for WDW and DL and it's pretty clear that DL's two parks have fared better than WDW's four parks. As I said, I don't know enough about the foreign parks to give a similar comparison, but I know, for example, the TDL has spent a LOT of money. If you want to include HKDL in the list, then you need to include everything there...it's all from the last 5 years. The only property that arguably fared worse than WDW is DLRP, but I would point out that the WDSP did open in the last 5 years, so you'd have to include EVERYTHING there in your list.