I'm not really a resort person. But I do subscribe to some travel feeds mostly in the vein of maybe finding some places/attractions/restaurants/etc. that I'm not familiar with. The number of hyper-scheduled spreadsheets I see is amazing. Doesn't mean I don't often have some itinerary and even book some particular, popular attractions/venues. But the 30-minute block scheduling is something I do for work (if that).
ADDED: I'll just add that I created a loose spreadsheet for a ~week-long NYC trip with (I think) just one timed admission for a recently reopened museum and no times otherwise. I think I ended up dynamically scrawling over the printout with changes for most of the trip.
If it works out for more that's great but it's not expected or necessary.
I've traveled with some people who seem focused on just getting pictures in front of as many things as possible which seems a poor way to really take in a place.
I think that's a good plan. I do tend to book hotels, planes, and usually longer trains. But, especially for a longer city trip, I loosely map out--even if just mentally--things I want to see and do but, for example, one museum a day is mostly enough unless another convenient one is small.
ADDED: I'll just add that I created a loose spreadsheet for a ~week-long NYC trip with (I think) just one timed admission for a recently reopened museum and no times otherwise. I think I ended up dynamically scrawling over the printout with changes for most of the trip.