Healing on the gamepad isn't hard if you set yourself up right. I'm not saying it's easier or better they using a mouse but it can still be quite efficient. Just set your default target so that you have easy access to any players you might need to heal. Personally I usually set myself as the main target because I am off the list. This way if I hit up I start at the bottom of the list, if I hit down I start at the top of the list. Using the D-pad to select names, I can get anywhere I need to on that player list quickly. If there's a situation where I'm going to be healing one person far more often than others, I set them as my main target. Given, I don't heal often but when I do I'm not deficient simply because I use a gamepad.