I took my kids on Monday and the line started around 9:30, the door doesn't open until 11. I hopped into line at 10 while my husband took our kids on other rides. We ended up waiting half an hour once the door opened. She spends a lot of time with the kids and Flynn does the smolder.
We did it on Sunday at the park so we were able to go Sunday/Monday/Tuesday instead of just Monday like I had planned. I'm so glad I checked MW before going, otherwise I wouldn't have known until I got home and I'd be so mad. We bought our 1-day 1-park tickets on Saturday and nobody mentioned the new option, but then I saw it here on Sunday!