It would appear you are a victim of your own success. You started at a time and place that no longer exists.
You learned to camp sucessfully at a time of few amenities and people. That is what you accept as normal.
As mentioned about the only way to achieve that now, is to boondock.
The DW and I come from a canoe and tent background, now we have a TT. Fortunately we are retired so we can camp during the week when it is less crowded.
Neighbors do not bother us all that much. After all they are public campgrounds. We are working our way to each of Indiana's state parks.