Hey, I've been there!
I waited for a long time outside Alice in Wonderland to get this shot:
<img src="http://www.themeparkphotos.us/g/g2/main.php?g2_view=core.DownloadItem&g2_itemId=10884" />
Which of course is still luck because I was using film, and the monorail was on "one-way using 1/2 of the track" due to the DCA construction, so it was going backwards for this shot. Those were fun days - trying to figure out which direction the monorail was going to be coming from...in fact I think I did have to stay and wait for it to come back in order to get the shot.