The key is consistent and heavy work with great technique. I think the biggest problem is that people don't use enough weight. For example, I would consider twice your bodyweight to be a fairly light weight when it comes to calves. If you train your calves consistently, they'll get stronger, allowing you to use more weight, thus increasing overload. It just takes a lot of work, time and effort. Also, make sure to go all the way up on your toes, then all the way down for a full stretch so that you're working the calves through their full range of motion. Rarely outside the gym do you use your calves through their full range of motion. I've been doing calves twice per week: one day I'll do 4 sets of standing calve raises and a few days later I'll do 4 sets of seated calve raises. For standing calve raises, try increasing the weight by a lot for your last set and just crank out a few really heavy reps (maybe just 3-4 reps). For seated calve raises, try doing a set, then remove some weight, another set right away, remove some weight, and so on until your calves feel like they're going to explode. Anything you can think of to increase your training intensity is good. If you just tack on a few sets for calves at the end of your workout and don't give it your all, you probably won't see much in the growth department.
How much they respond and develop is up to your own genetic potential but I'd wager that most people on these forums aren't up to their natural genetic potential when it comes to calves. By the way, my calves suck as well, but since I've been hitting them hard, I've noticed some improvement.
It might take months and months of hard work before you notice any change.