I'm an older woman, going solo and I just booked at trip for mid-April. The only thing I've done so far is make my resort reservations and bought my tickets. When I get my ticket confirmation I'll go ahead and make park reservations but I have PHs and (fingers crossed) they might change it some time next year where you don't have to wait until 2pm to hop.
For now, I'll just make reservations for parks sort of willy nilly. Well not really will nilly. I will be there for 7 nights so I bought a 6 day hopper, since I drive down I usually don't go to a park on the day I leave since I get up and get on the road (7 1/2 hour drive). I'm doing a split stay - 3 nights at ASMus and 4 nights at Dolphin (money reasons). Since the Dolphin buses drop off at MK at the TTC I'll go ahead and make a park reservation for MK for one of the days I'm at ASMus. I always go to Epcot the day I arrive. Then, I'll just make whatever for the rest of the days since I know I will hop (2 pm or not). You do have to check in to the park you have reservations at, no getting around that but you could always just tap in, turn around and leave and go to whatever park you want to (after 2 right now).
I don't make ADRs in advance, just day of either when I'm back at my room for an afternoon rest or while walking around the parks. I have never not been able to make an ADR somewhere the day of. It helps that I'm an adult and don't really have to eat at the "must do" place and the time doesn't really matter. Since I'm a smallish woman, I usually tend to eat at least one meal a day just snacking around the Epcot festivals. I've been twice since Genie+ started and haven't bought it either time and rode everything I wanted to. Park hopping helps with that. One trip it was very crowded, another just about every ride was a walk on.
What I do for rides. Let's pretend I have a reservation at Epcot the day I arrive and I arrive around 2 pm. I'll go to Epcot, get something to eat, maybe ride a ride or two and hop over to whatever park I have reservations for the next day. In our pretend trip I'm going to say MK. In April MK is probably going to close around 8 or 9. I get there around 6 or so. Walk around and hop on a ride or two, later in the day the lines aren't too bad. So far I've ridden a few rides at Epcot and a few rides at MK. Next day I get up whenever and head to MK. Maybe I grab some breakfast, just depends on when I get up and get over there. I ride whatever I want to that I didn't ride the night before until around noon or 1 then go back to the room to rest/swim/explore/whatever. Some time later - could be 3 or could be 5 who knows, I head over Epcot to get something to eat. Maybe I ride a ride or two, maybe I just eat then head over to whatever park I have reservations for the next day. Rinse and repeat. Doing it this way, I'm never pushed to get rides in all in one day, I don't mind waiting in line since I don't need to ride every ride and I'm really there just to enjoy the place and not rush from ride to ride to ADR.
No plans except the park reservation for the first park of the day. I eat when I want to, or I just snack all day. If I want to stop and sit on a bench and just watch the people, I do. If I want to ride a ride, I do.