Depends on how you define ground clutter, I guess.
AH has had stuff on the beaches such as tank traps and the like since I started playing, but it was only a graphic, it wasn't "there" and could be turned off as ground clutter.
Since the new version (1.08), "real" ground clutter such as the tank traps and trees have been added, and these indeed can't be turned off. However, a new graphical layer was introduced to cover the ground texture which is supposed to add to the feeling of ground speed, I understand. It's this layer that gives the shimmer, and that can be turned off with control-C.
If you're not signed up yet, you can still play head to head. That's free, and will give a chance to "get with it" before you come into the MA.