No fights, just good reasons =)
You can still read your mind though. Leaving the game because NMs became too easy (said from a R50 Thaumaturge) is NOT sufficient to have you hate the game. To be honest, I don't want to believe that because you're a R50 Thaumaturge you found the NMs a really easy challenge at pre-patch.
Believe me, I'm a R45 Marauder and still me and my team find it hard to down the Great Buffalo. It has gone pretty balanced: You had a 15 members party versus a mighty Great Buffalo. Now you have 8 members fighting a Still mighty Great Buffalo. If they had kept things as they were, it could not be done.
And anyway, if people want to leave because of only one of their supposedly bad things of the game, at least 8 millions of players would have left WoW now.
I think you should have taken the leveling easy and soft, not hardcore and obsessive. Like this you've ruined the fun of getting low-level content on your favourite class. You can still change to your low class anyway.
If you don't want to take it easy and continue hardcoreing into the game, then do it, but you're losing a bunch of things. Dang! There are so many things you can do out there! Take a guitar, pencil and paper, old Duke Nukem games or the first thing that you'd like to try and try it out! You can't go always like FFXIV FFXIV FFXIV FFXIV in all your lifespan. Do some variations, like FFXIV Portal2 Crysis ...
Take this post as a friend's advice =)