I totally understand the anxieties! I had them before my trip, too. I was wondering what would happen if Genie dropped at the beginning of my trip… But if Genie drops right when you show up, everyone will be in a similar situation. I imagine it would work very similar to WDW, which there is a lot of information about.
The signages for Lightening Lanes are up all over the parks. I saw them last week.
I only had one dining reservation over 3 days. I felt that there was plenty to eat in the parks and I felt weird sitting down to eat by myself. I did walk over to Downtown Disney between park hopping to eat lunch at Black Tap. I felt that mobile ordering was very available, even around meal times. You can stand in line, also.
I also felt that I got a lot done over 3 days. I could have done more but I chose not to do more.
You already got some great ideas above. Reading trip reports and asking specific questions helped me out immensely. Plus, if you are used to doing touring plans, you can do this. Rope dropping and late nights are the way to go. Lines are always long mid morning to mid afternoon. Those are great times to eat, shop, and/or see characters, if that’s your thing.
Also, I felt that the rides broke down very often. But unless the CM cleared the queue, I stayed in line.
If you are interested, I wrote about my trip here: Eating My Way Through DLR.