This plugin shows various interesting statistics about your track when you are in editor. Activate the plugin and you can see the statistics in the menu (Menu -> Scripts -> Utilities -> Block Statistics) after refreshing the statistics there. You will have to use the refresh button to renew the statistics after editing the current track, as the plugin will not automatically do so to save computation time for the game. The menu point will not show up when you play a track in local mode or on a server.
Currently displayed statistics are
Track name and author
Ratio between grass blocks and other blocks
Most used block (Grass and common pillars are blacklisted from this)