I've noticed that too. Thankfully it looks like CA have finally removed this expliot from the game mechanic's. It still gives a slight benefit but its not so overpowered as it was in other versions. I remember watching my son defeat an entire army using this expliot and one cavalry unit.
However, I have noticed that charging cavalry through a formation seems to work as it would have historically. If you can find a unit which has lost cohesion due to crossing an obstical or being rushed around too much and actually target your cavalry to gallop, not at it, but through it, I found that nine times out of ten having the cavalry pass through them will cause panic and rout.
Once they have routed it just becomes a case of slaughtering them as they try and escape. This also has the advantage of keeping your horsemen moving so that they don't get bogged down in a pointless melee with infantry.
For me this tactic also has the added attraction of being the closest I can get to using TW cavalry in the way it was used in real battle.
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