A ME pass is my abbreviation for a multiple experience pass. These replace your LL when a ride included with
genie+ goes down during your return time. They always include everything including rides that don’t have a dedicated LL entrance except Rise, Space, Matterhorn, Indy, Peter Pan, WEB Slingers, Racers, and Toy Story. However if the ride that goes down is Space, Matterhorn, Indy, or Toy Story the ME pass includes everything except Rise, Peter Pan, WEB Slingers, and Racers. These passes are valid for the rest of the day.
The all day pass I’ve been referring to is for individual
lightning lane rides that are not included in genie+: Rise, WEB Slingers, and Racers. If you have a LL booked for one of those and the ride goes down during your return time your LL is converted to an all day pass valid only on that ride. So for example on this trip Rise went down on 3 separate occasions during my LL window and my LL converted to a pass valid all day only on Rise and not on any other ride whatsoever.
Whether you get a ME pass or an all day pass as I referred to them the system basically forgets you booked that ride in the first place and allows you to book it again. So for example if you book Grizzly and it goes down and converts to a ME pass you can book Grizzly again. And if you book Rise and it goes down and turns into an all day pass you can book Rise again.
When a ride goes down you can still book a LL at some point, although they push back the next available time. So for example normally Grizzly LLs are immediately but if it goes down the next LL might be in a half hour. But you can book the next available time and hope it stays down until then. The point at which it converts to a ME pass is different every time. Sometimes it converts 20 minutes before the LL window, sometimes it converts right before, sometimes it converts 30 minutes into the window, and occasionally it never converts. Once it does convert though it’s a completely bonus LL and you can immediately book another one. But if it hasn’t converted yet you have to wait until one of four things happen in order to book another LL: for the LL to convert to a ME pass, for the ride to come back up and you actually use the LL at that ride, for 2 hours to pass, or for the LL to expire. If a ride continues to be down you can continue to book for that ride as long as it keeps converting to a ME pass. I was never successful in doing it twice in a row for a ride just because it always came back up before that was possible. But if the temporary closure is really long you could certainly get multiple ME passes from that.
If you want to go land by land my suggestion would be to make sure you book the rides that are the biggest priority to you regardless of current ride breakdowns. So if you’re gonna be in Tomorrowland soon and you for sure want to do Space Mountain (and trust me you do NOT want to wait in that standby line because LL is way over prioritized there) then make sure to book Space Mountain. But if you see that a ride is broken down with a fairly soon return time and there’s a lot of things in the land you’re in without LL that you want to do go ahead and book the LL for the broken down ride and then you might be able to use that to your advantage later in the day. For example, say you’re in Fantasyland and want to do a lot of rides there but hardly anything over there even has LL and you see that Buzz is broken down. Go ahead and book a Buzz LL and do rides like Peter Pan, Snow White, etc and keep checking to see if your LL converts to a ME pass or if Buzz comes back up. If it converts to a ME pass during that time you haven’t wasted any time you could be using to use LLs but now you have a bonus LL that you could use on Millennium Falcon later when you’re in Galaxy’s Edge.
Also keep in mind that there are a good number of rides that typically have LLs available immediately. These are typically (from my experience) Star Tours, Buzz, Autopia, Small World, Roger Rabbit, Thunder (sometimes), Falcon, Splash (because it’s January but also it’s closed now), Grizzly, Monsters Inc, Incredicoaster, and Goofy’s Sky School. The others are usually about 30-60 minutes ahead (except Soarin’ is usually over 2 hours away and Toy Story is usually about 90 minutes away). If there’s plenty of ride breakdowns that you want to take advantage of, use the breaks in between LL conversions to ME passes to knock out the LLs that are immediate. For example say Matterhorn is down and you book a LL for it and it eventually converts to a ME pass. You want to book Matterhorn again but you’re in Tomorrowland and want to do Autopia, Star Tours, and Buzz. Before booking Matterhorn again quickly knock out those Tomorrowland rides and then book Matterhorn.
Also when you purposely book a LL for a ride that’s broken down keep checking as often as you can to see if the ride comes back up. Once it comes back up there is no longer hope for a ME pass for that specific situation.
Hopefully this helped answer your questions, is there anything else I can clarify?