We went during the second time slot last month and saw Buzz, Woody and Jessie. We got there right before they were scheduled to come out, but it started raining. We momentarily took shelter and were told that the characters can't come out in the rain. Everyone left and shortly after it stopped raining they came out. We didn't have to wait in line at all. As a bonus, we turned the corner and there were Miss Piggy and Kermit. We got to see 5 characters in a 3 minute time span!!
Lesson learned: if it rains, head to the character greetings.