Hooray, a whole 2 hours...
1.) I routinely kill 2 or more enemies in the same head-on pass (with guns, duh), plus I routinely take out turrets before they can hit me even once, so my gunnery/flying skills are at least average.
2.) Ramming stuff is much harder in WC3/4 than 1/2 and Prophecy, so actually it takes quite a bit of precise maneuvering to plant myself up an opponent's ass. I never "have" to ram an opponent, I just happen to have a lot more fun doing so, but I usually save the ass-plant for bandits that REALLY piss me off.