Deer can be quite the issue. There are a handful of cities in Utah (and I'm sure other places) who have opened up hunting to archers - within the city limits because the deer population is out of control.

Back to the tree side of the story - I'm in NW Montana where trees are like weeds. In the spring I could find 1-2 fir tree seedlings per square inch and sometimes 4-5 in an inch! Despite having quite a few deer, forests are thick. I should rent some sheep to keep down the "weeds" we call trees.