Ok, so I'm fairly new to this game (level 11 with level 9 cooking, level 9 skinning, and level 6 farming) and I noticed the differences in pace to achieve each of these levels. Cooking was by far the easiest. Of course it requires the most work, but the exp given makes it worth it, plus when you cook, you don't have to monitor your character like with farming. Farming is my biggest concern, it is by far the most time consuming of the professions I have done (2nd most time consuming being leather working) and I was wondering if I was doing something wrong in farming. I just plant wheat seeds over and over for exp and it doesn't yield much for the time spent doing it. My suggestion would be to make the more time consuming/hard professions award more exp.
This has probably been suggested already but I am not sure.