For shits and giggles I was running around with a great lance the other day, and it's way more effective at killing infantry than a thrusting heavy lance (IMO). The only down side is that you're very weak versus cavalry, but I'm on a champ courser so it's not really much of an issue. The other downside is the cool down timer, if the enemy infantry is heavily engaged I can keep thrusting with my heavy lance every 3 seconds, whereas I have to wait 6-7 seconds with the couch timer, and I can't stay in the thick of combat, I have to make large circles and come back.
I honestly think it would be cool to see more great lance cavalry charges, and that would happen if you removed couching from the heavy lance. I would be unhappy about it, but I would be fine at the end of the day.