I'm happy to say that there have been so many new great things in the last couple of years I'll probably forget a few right now.
The new Haunted Mansion and Pirates updates are awesome. A perfect example in how a classic attraction can be updated and freshened up for a new generation without hurting what made those attractions classic in the first place.
Expedition: Everest. An instant classic, and a BIG return to form for Imagineering. Great queue, great ride, great theming, and a welcome addition to the Animal Kingdom.
Spaceship Earth. Overall, a much improved attraction. I'm not sold on the new narration and the new musical score is a BIG letdown, but all the plussing done to the sets and animatronics are simply beautiful. I think the blue starfield in the descent is really cool and I'm probably in the minority, but I think the screens are okay. I think the old, mostly burned out fiber optic and neon tubing in the old descent needed to go, and I'm excited to find out what else might be added to the ending.
I really like the Laugh Floor, and the fact it will be a different show each time adds a lot of re-rideability to it.
And there are plenty of smaller things too. I think the upkeep and polish on the parks and the attractions has shown a lot of improvement lately. The holiday overlay on the Castle this winter was simply beautiful, and a welcome surprise.
But I think the most exciting thing is that in spite of all of the recent changes and additions there's still SO much more on the way. We're right in the middle of a new building boom, and I think we're in position to have a great looking, fun, and exciting Walt Disney World in time for the 40th anniversary.