We are here right now at Vistana.
The shuttle to Disney is now free; you get a shuttle pass to use.
You have to pick it up at the "activities desk" -- where they will also ask you if you want to do the timeshare presentation. (We did, no big deal, and got 75 Disney dollars.)
For July 1-31, the Disney shuttle leaves at 7:55 for Magic Kingdom; Animal Kingdom, and For all parks at 9:00, 10:45 and noon.
Return is at 4:45, 6:15, 7:40, 9:00 and 10:15 (adjusted for parks);
You can purchase transport to Universal and Sea world on a bus charter which picks up from other hotels on the way.
hope this helps. let me know if you've any other questions.