Huge thanks to everyone here! Ive been following for the past few weeks and I finally got a BG today! I couldn't have done it without ya'll. Here was my experience:
6:40AM: Arrived at Hollywood Studios. Lines were already past the ticket booths but I followed everyone's advice and lined up on the very right, next to the green construction walls. Great tip! Our line moved 4x faster than everyone else's when the turnstiles opened since we split into the 4 or so other lanes that opened up after the construction walls.
7:00AM: Turnstiles opened and I speedwalked to SDD
7:10AM: Arrived at SDD at 7:10. In hindsight I should have RAN! They lined everyone single file through the beginning of the queue all the way to the giant Woody statue. So the faster you get there the better your position. Unfortunately there's no opportunity to push through the crowd to get a better spot. Everyone who arrives after the queue was full was held behind a rope 10 wide and let into TSL at 8AM
8:00AM: At 7:59:30, I killed
MDE and reopened it and then at exactly 8AM on my phone, I hit Find Out More and Join Boarding Group was red and got BG5!!!!! I couldn't believe it! I was shocked! I think what really helped was that I was on data. I did a speedtest on both and got 10Mbps download on WiFi and 80Mbps download on data (GoogleFi/Pixel 3 phone). That's 8x faster!!
8:15AM: From my position in line (right across from Toy Story Mania) I was boarding the ride in 15 minutes in a constantly moving line.
8:16AM: BG5 called and given 2 hours to return
8:30AM: HUGE TIP! like everyone else in this thread has said, get a boarding group as fast as possible even if not everyone in your party is selected or present on the selection screen. I made a friend in line while waiting for SDD and he wasn't being recognized as being in the park for some reason and could not join a boarding group even after refreshing and killing the app. I offered to go to GET with him after SDD and see what they could do and they gave him BG18! The reason he wasn't able to get added to BG5 was because they can't add someone to a BG that has already been called so make sure to go GET ASAP if you have problems! Note that this was a complete stranger, and we were not linked together in MDE or had the same family name or looked alike or anything, and all we did was explain that we were in the same party and they gave him the next available BG no questions asked. I'm sure this would be just as effective with your real family members or you could try doing this with a new friend/stranger and make their day!
9:01AM: Entered the line for RotR with my new friend
9:31AM: Got into the first preshow
9:57AM: Exited the ride. The line was continually moving and never stopped at any point except right when we got into the actual ride vehicles. We waited for a solid 3-5 min while the CMs tried to fix something before we were off!
Overall, amazing ride and definitely had some jaw dropping moments. I will be trying again tomorrow and Monday!