I was just there today, and DL opened at 10:00am. We were in line at the gates at 9:20am (we were almost to Cal Adv). They opened the gates at 9:30, and we were inside at about 9:40. I stopped at the main gift shop and when we walked out the crowd on Main St. was backed up to the bakery. At 10:00 they dropped the ropes and we went straight to Buzz Lightyear. We rode it twice in 20 minutes. Then we had our picture taken in front of the castle. When we got to Peter Pan it was already 30 minute wait. We should have gone here first, but with 2 little boys, we had to go to Buzz! It was a bit crowded, but I've seen worse. Just do the rides without FP first.
Have a great time!