Last time I was at Disneyland, I saw a whole bunch of ghosts. They were over in the nice looking house on the west side of the park near Pirates of the Carribbean and Splash Mountain. Supposedly one followed me home, but I have never seen him here.
I've looked many times for the HM Timmy (there is also an IASW Timmy and a PotC Timmy... general name for ghosts without a story I guess) who I read supposedly sit next to the final raven above the Doom Buggies at the end of the ride, though I've never seen him. I've also looked for an orb at the graveyard descent, I've seen pics of that.
there was another story i read before about the WDI that died while working on pirates in WDW. Supposedly the story said that castmembers still say good hello to him at park opening and goodbye if not they usually have problems with the attraction