There is no general statements that can be made about the Maine woods when it comes to being dense. Tree lines vary greatly too. In some places the tree line is only at 1400' (Penobscott Mt) and some 4000' hills have no tree line. As an example, Saddleback Junior has a tree line and is only 3655' and Spaulding does not even though it is close to 4000'. Sugarloaf has some of the densest firs in Maine and Poplar is relatively open. The beauty of Maine is the ever changing landscape. We have a great variety of trees. You can walk through a softwood grove and minutes later be in a hardwood grove. One minute you can't see 15' in front of you in the woods and a few minutes later you can see several 100 yards.