I love hearing the horror stories too, because I can include myself with them. I went with two girlfriends from college for a long weekend at Disney. They said no problem with getting up early, we've never been there, show us Disney etc..etc..
My Disney: At the parks for opening, enjoy the rides asap, then relax sightseeing around the parks for the rest of the day and hit the rides again.
Their Disney: Going to Pleasure Island, spend $75 a night (or more!) on drinks, sleeping until noon. Don't ride RnRC or ToT, but Teacups are ok. Repeat.
By the end of the trip, I ended up leaving a note on the table and going to Epcot by myself. Got to ride Soarin', saw Crush, helped a camera CM reach her quota for the day, rode Test Track, shopped in the Worlds, and ate lunch...all before they met me at the park.
The big thing is to make sure you plan time for YOU. We are doing this again (not the same people thank goodness, another couple) and they have already concluded I'm "Too Disney" for them. We've agreed to 4 days together (out of the 9 we are there) to go to the same park and eat lunch or dinner together, but not tour the parks together. That's it.
All I asked from them was a picture of the four of us in front of one theme park.
