They're pretty prevalent around the parks. Not as much at resorts, but there are some resorts (Poly, GF, WL) where you're more likely to see them. Over 8 park days, we had around 1000 photos.
In the
MDE app, you can filter on the map for PhotoPass, and see everywhere there's a PhotoPass photographer in the park. Some of those markers would represent multiple photographers too - like on Main Street in MK, seems like there's a photographer every few yards.
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You'll usually get 5-10 photos from each photographer, more if you have a group and want to do different groupings of people. Some of the photographers spend a lot of time too, if you want it. One particular photographer in Galaxy's Edge took 5-10 min with us, positioning us to get shots in many poses with three different backgrounds, and including several magic shots.
Unlike the cruises though, you won't get candid photos (unless you're on a tour with a photographer like Wild Africa Trek or something like that). These will all generally be posed photos.