There's so many...
One of the users here (sorry, I can't remember your name!) runs a
"lens" at Squidoo, which is basically a list of links to Disney park galleries that he likes, there are many good ones there.
You can also use this very forum - find a picture you like and look at where the picture resides. (If you use Firefox, you can right-click it and "view picture" and it'll show you the actual location in your address bar. If you use IE, then I suggest you use Firefox

but you should be able to right-click the photo, go to Properties, and copy the URL then paste it into your address bar.) There's a good chance that you'll be able to use that information to find more pictures by that user.
For some examples, let's take the first few entries into the current photo contest.
The first is from Dizholic. The picture's URL is:
http://i47.photobucket.com/albums/f191/
Dizholic/Orlando%20Feb%20Mar%202006/103_0329.jpg
I boldfaced the important information - his Photobucket ID. You can take that ID and go to Photobucket and search for it. That lets you discover that his albums are available for viewing here:
http://s47.photobucket.com/albums/f191/Dizholic/
Note that the domain name is slightly different, so you can't just chop off the end. It's possible that you can do that and just switch the "i" to an "s" at the beginning but I haven't tried that much - but it looks like it should work. That would save the effort of searching.
Next is brandt79. The picture's URL is:
http://www.wdwinfo.com/photopost/data/500/96037s_Corner.jpg
This is slightly trickier - but we still have the information we need. WDWInfo is linked with the Dis, so the IDs are the same. You have to go to the main WDWInfo photo page, which is here:
http://www.wdwinfo.com/photopost/
Then you can browse for their ID. You'll eventually find their photos here:
http://www.wdwinfo.com/photopost/showgallery.php?cat=500&ppuser=96037
Next is daannzzz, who also uses Photobucket, so the process is the same as for Dizholic. However, they have their
Photobucket site set to not allow browsing, so you will not be able to view their collection.
Next is juligrl, who uses WDWInfo, so repeat that technique. Extreme8 and er3465 also use Photobucket, so we'll skip them.
Next is campinggal, her photo's URL is:
http://campinggal.phanfare.com/show/external/58587/58587/8504504/file.jpg
That's easy since Phanfare gives you your own domain name:
http://campinggal.phanfare.com/
The next non-Photobucket user is 0bli0. His photo's url is:
http://homepage.mac.com/imagetechphoto/disney/
disneyland/l209.jpg
In cases like this, start chopping off words past the slashes. In other words, try getting rid of the "l209.jpg" and you'll get to his Disneyland photos. Cut off the "Disneyland" and you'll get links to all his Disney photos. Cut off the "disney" and you get at his first page, but you don't get the links to the photo collections, just the slideshow - so what you're after is:
http://homepage.mac.com/imagetechphoto/disney/
Next is Roger Ramjet whose picture is:
http://www.adamsputnik.net/beer.jpg
You have no choice here but to just go to his page. There is a gallery but not a Disney one, so you won't find the Disney photos here.
The next different one is rtphokie whose picture is here:
http://rtphokie.smugmug.com/photos/93519038-M.jpg
Smugmug, like Phanfare, gives you your own domain name. Easy peasy!
http://rtphokie.smugmug.com/
There's plenty of other photo sites (and people hosting pictures on their own sites) but with this info, you can usually find more photos by someone whose pictures you're enjoying.