Absolutely right about the back up in Holidayz in Hell just because people are stopping to take pictures at every - single - segment. It was driving me crazy.
I also want to note that I think it would be best to stick to the original game plan of doing the backlot first. Here's a bit about my experience. I did Stranger Things first and had maybe a 20 minute wait once the maze itself opened. Went to the backlot and everything was slammed to about 50 minutes or more. I left there around 7:30'ish, when usually I'd be out by 6. Then, everything else I hit for the rest of the night was completely slammed as well, except for UCM for some reason (30 minutes). But TrT was listed as 60 minutes, and Terror Tram and Halloween were listed as 90 minutes and weren't very far off from that. At most, I'm used to waiting 20 minutes for everything and maybe ONE maze where I wait 50-70ish minutes. Usually I'm ahead of the crowd, but here I felt I was mostly with it.
So I highly suggest, do the backlot, do TrT, Tram, upper lot mazes, then return to do Stranger Things right before the park closes to get the shortest wait for that. Not to mention, even though it's in a soundstage, there is a TON of lightbleed that entire maze since there's hardly any roofs. I may even suggest to wait to do TrT for later as well, because like last year, after 12 AM, that maze has a 15 minute or less line. It might be counter productive to go up to the upper lot right at the opening swarms at 7 PM though, so I can't say that'd be the best route to take, but it may be worth trying. But if you skip Stranger Things at first, and you're done with the backlot by 6-6:30, TrT around that time should maybe be 30-45 and won't be that bad of a wait.
Just some thoughts! Alright, time to work on my review.