Little Sis lived there for a while. She loved it. During visits, I had to admit that the "dry heat" didn't feel like 112, but I noticed I couldn't touch the steering wheel on a car without losing finger prints until the AC had run for 15 minutes. Little Sis did have a pool, but no grass or plants. It would take some getting used to. I know some folks who have adapted and love it. As long as I can afford more moderate weather, I'll stay put. YMMV as always.
We're also in SE Arizona. We've been here only a year, but we love it. It's sunny and 65-75F almost all year, for a few hours, but you have to be out around 6-9 am in the summer (May-Oct) and just past noon in the "winter" (later Dec through Feb). So we adjust our schedule to be outside for the several hours when it's most comfortable when we are walking, hiking, or biking.
We actually don't mind errands during the hotter part of the day. We remote start the car with the AC blasting for 5 minutes ahead of time or while loading up our groceries. It's enough to take the edge off.
One trick we learned from the "locals" (almost everyone is from someplace else like CA or the midwest), is to move here in the winter. The first winter feels downright balmy, and the heat starts slowly, beginning in late Apr or May. By June it's hot as hell, but by then you are somewhat ready.
Honestly, July and Aug are the toughest since it can be 80F at sunrise and rise over 110F for weeks, even hotter in Phoenix. We still manage to do a little hiking and walking before (preferred) or after sunrise (still hot, but the sun is down).
I can appreciate why some coming to SE AZ in the summer, without months of gradual acclimatization, would never want to return. I do wonder if we'll grow tired of the long hot season, just like we grew tired of the long cold, dark, and wet/snowy winters in Frozen Flyover that seemed to last from nearly Oct through April. Time will tell.