With the way it is now, since we cannot enlarge the screen without messing around with our general screes resolutions, this is simply making the balloons clearer, in some ways simply compensating for the increased monitor sizes which have effectively ''shrunk'' the game screen and everything in it.
I was mining south east of Draynor yesterday, having difficulty seeing when the rocks respawned for the same reason. I always thought that the advantage we have in game over bots is the power of sight. Unfortunately, the bot I was competing with had a much better way of telling when the rocks respawned (happy to see him chased away by Mr Hyde).