I do something similar to @trscavo. After cropping or editing the photos in Apple Photos, and adding description and keywords if desired, I select the photos I want, then use File --> Export (to a folder I call iNat), upload to iNaturalist from there, and then move the exported photos to trash.
I do a couple of things during the Export, though (in the Export window). First, I use Medium quality and Custom size, with Max Dimension 3000 pixels. This seems to speed up the process without sacrificing quality significantly. Then, I check the box to export the metadata (time, place, and description). I’ve already written notes in the “description” field for Photos, so these notes are exported and all I have to do is edit them if necessary before final submission to INat. (I did discover that if several photos are combined in an observation, only the description of the top one is used.)
I can’t claim this is particularly fast. But the cadence is about right for me. I get to think about which photos will work best, what notes to add, and what order to put them in. The metadata transfer is seamless, and I don’t make a lot of mistakes I’d otherwise be prone to.