I love my heavy lance, and being able to use the couch when there's a heavy infantry who just keeps down blocking my thrusts, or when there's a heavy horsemen who keeps manually blocking my thrust attacks at his horse. Versus aware people, cavalry lancing is basically useless (unless you can bump-lance, which I've only ever done on accident), both thrusting or couching. Thrusting people can easily just down block you if they see you coming, and couching they can easily side step you as well.
I personally wouldn't want to see this, as it would be another nerf to the already nerfed lance from horseback, but I think it might be a pretty fair "balance" between the lances.
To keep this in perspective, I never 1 hit someone with my thrust on my +3 courser riding at full speed, unless they are very weak (low str character) or they aren't wearing a helmet and I hit them in the head. People can complain about the damage cavalry does, but two points:
1) Damage output goes both ways, if I'm riding fast, I take a lot more damage as well.
2) I am riding the fastest horse in the game, and thrusting a weapon that is putting that speed, as well as my weight (and the horses) behind it. That's a hell of a lot of weight behind that tiny little point that is piercing you. It is going to do a lot of damage.
I don't think couching is easy mode, or press x to win mode. The only time it works is against unaware/engaged infantry, or people who are slow and heavily armored (and would otherwise just be able to sit in and open field and down block me until the ends of time).