I agree with this. BM hunter has been one of my favorite alts for years and I was very bored with it this patch. Leveled my fire mage from 85 to 100 this week and was having a lot more fun. Same with elemental shaman. I'll be sticking with my warlock for my main but my mage and shaman will get more play than my other alts.Both MM and BM hunters are somewhat overtuned right now, but they should continue to pull good numbers. BM is extremely boring, MM has a few more keybinds depending on how you spec but it's still not the most complex spec either.
Fire mage looks really fun, you should give it a try.