During our trip Aug. 4-11 at MK Woody and Jessie were together across from the Diamond Horseshoe in the sweltering heat. The line was probably at least 15 families each time we walked by. I can not imagine why they were out there instead of inside where it would have been cool!
At MGM we saw Woody, Jessie, and Buzz at Al's Toy Barn but they each had a separate line. There was also a Green Army Man.
The area in Tomorrowland where Buzz used to do meet & greet is being turned into the new Monsters Inc. attraction so I don't know if he is still around there sometimes or not.