We here this all the time about photogrammetry areas. The problem with PG is that it varies enormously for different areas. Look at London compared to NY. I flew a short time with PG but now fly exclusively without it, and I much prefer it. Simply by the way PG collects data it will never be able to capture the detail necessary to recreate high quality structures such as suspension bridges, ferris wheels, or anything with fine strands of detail. These can only be created by using higher resolution capture techniques such as low flying aircraft or drones. The only real option in MSFS is for these individual elements to be hand crafted. Everyone to their own, but IMO, I much prefer to fly with PG turned off, I mean let's face it, with PG off, the scenery is still a 1000 miles from default scenery in FSX or P3D.
As for trees, there is a cfg tweak you can make for reducing the size of trees, you may find this can help things a little. Alternatively, why not try REX's Accuseasons, that has an option to reduce size of trees in the UI. I love this product BTW.