I always carve hard as f'ck, especially when not switch. When going in switch, I carve a lot before the jump, and then carve just a lil bit when taking off. I also carve no matter what trick it is, even 180's.
I don't know why I do it, but I feel more comfortable when carving and "drifting". I think it puts a little more style in to it as well. I recommend carving!