OK...I'll add in a few thoughts
The parks are now letting people in around 8:45a and by 9am, the popular things are boasting very long standby wait times. We didn't pop by the A&E M&G, but I remember being over by SDMT just after rope drop...maybe about 8:55 am...and the standby line was already about 2.5 hours. I was a dork and took pics of the insane line. Not sure if the M&G is any better, but you might start watching the MDE app each morning to see what standby times jump to right around park opening to see if it's even worth dealing with the potential stampede. Conversely, you might also see what waits are like around Wishes. Again, didn't try it with A&E, but we rode SDMT standby one evening...got in line about 30 min before the start of Wishes...posted wait was 45 min...only took about 20 min to get through the line.
I don't love the tier system in Epcot or DHS either. It's more manageable in Epcot though. We had FP for Soarin' very early since even that FP line is known to back up. Test Track was busy, but that line is at least interactive and moves. Of course, there were no tier 1 FPs left when we exhausted our first 3, but Epcot has more to do so it wasn't really frustrating. DHS on the other hand...I think the best FP we could get after exhausting our first 3 was Muppets. So, we hit up RnR's single rider line. It was still a fraction of the time posted for standby.
AK at least worked pretty well and MK- beyond A&E and SDMT -we were always able to get more decent FPs. So yeah...don't love it...but also don't missing having to run for FPs when a park opens. And the reality- they've invested waaaaaaaaaaaaaaaaaaaaaay too much $ into this to let it fail. We know they work slowly with changes, so we may see more modifications with the system, but who knows when.
Finally, stalk the website. You never know when someone might change plans. I think we were 2 days from the start of our trip when I snagged one for SDMT at my ideal time. You just never know
And ultimately, you'll be at WDW and you noted you're finally going to get to try BOG! I'm sure you guys and the boys will have a blast!!!