When we were there in late April the Toy Story greeting times were from about 9:30 till 3:30 at Al's Toy Barn, with a 1 hr break at about 1:00pm. (they also take what they call brief water breaks which is just switching CM's) Line was very short for us but overall very light crowd that day. Pizza Planet is just around the corner and my DS loved that too. We saw Jessie there.
Also, for big Toy Story fans, if you are at Downtown Disney look for the big statues of Buzz and Potato Head outside Once Upon a Toy. We got some great pics there.