When I joined the Palia team, I extensively used SpeedTree to create large performant tree models for our maps. Many models were eventually reworked in SpeedTree to help us hit our performance goals, as a multiplatform MMO. I also later pursued Gaea as our solution for creating vistas, which with some Zbrush work can yield pretty nice stylized results.
https://www.artstation.com/flwlss
https://www.artstation.com/mayamahalingam
https://www.artstation.com/airbornstudios