Its easy, its just like every other 3D area on google earth, except slightly more detailed. For some reason though, whenever I try and see the 3D Disney World, my internet looses its connection and I have restart me comp. It's weird.
I tried the 3D Walt Disney World, and while it was cool, it took forever to load all the 3D textures in (like with all the 3D Worlds). I looked around for about ten minutes before quitting. It was easy to do, just incredibly slow. (And I have a fairly fast connection with high RAM.)
My Brother in Law who was a technician for IBM before retiring can't make it work and neither can I. We both have the latest versions of Google Earth and the Warehouse with all the disney stuff checked but when we click on See WDW in 3-D nothing changes, just the same flat photo based ground. No buildings or rides or whatever you are supposed to see. I click on the gold Mickey and all that does is make more thumbtacks and camera's appear. So I rate in Hard and doesn't really work at all for some.
Definitely not easy. I can get it to a point but it takes awhile to refresh the screens and some don't appear at all. I periodically get messages that Google Earth has encountered a problem and needs to close.
I have a fast reliable connection and a fairly high end computer so I have no idea why it isn't better.
Incremental Update to Google Earth 4.3.7204.0836 (beta)
Google has released an update to the 4.3 beta released two weeks ago which fixes some bugs (no new features that I see). This is still a beta version, so Google probably has more things they plan to fix before finalizing 4.3. You can download it through the Google Earth Download page, or if you haven't downloaded 4.3 before, you can use GEB's download Google Earth page. Thanks to Frederic for the tip that this was now available.
Here are some of the things they fixed in this incremental release (still waiting for official release notes):
MAC only- Whenever balloon has enough text to require a vertical scroll bar, the horizontal scroll bar shows up as well. Even though the horizontal text are not wide enough.
Bottom margin of balloon is too big.
Balloons sometime do not render image when clicked repeatedly.
Sometime balloon does not open in Vista machine.
"to here"/"from here" does not work in newly created placemark.
Navigation from camera views (above horizon) is broken.
I can't get it to work either. I click on the button that says view in 3d or whatever it says and nothing ever happens. They need a bit better support for this.
What version of Google Earth are you using?
Assuming it is current. Clicking on "3d Buildings" does not do the trick (err, I don't think...) Zoom in on WDW and look for the golden mickey, click on that. That should bring up a window with a "view in 3d" option.
"Whenever you find yourself on the side of the majority, it's time to pause and reflect."
its weird for me, i have the newest google earth and when i click on the mickeys all i see is the buildings all like mashed up together like the shape of splash mountain. if i have time tomorrow, i'll take some pics.