While I sympathize with your trouble(unless you're a fekkin troll

), one of my main reasons for leaving WoW is the "dumbing down" of the entire game. WoW is a shadow of what it once was. It was never difficult per se, but it was at least difficult enough to keep me interested.
As others have stated, gaming is a hand-eye coordination, dexterous activity. That's part of the "challenge" of video games. I play games for fun, and for something of a challenge. This is how gaming has always been, and hopefully always will be.
This is probably the reason I am beginning to believe Dark Souls is(one of) the greatest games ever created. It's hard as hell, at least was, and continues to be as I progress through the game. After completing an area I can go through it with minor difficulty again, but it's still not a cakewalk, I still must pay attention or die.
So, without trying to sound insensitive, gaming is probably not something you should do as a hobby if you are finding WoW difficult. Or at least stick to simpler games, or ones that don't require a large amount of hand-eye coordination to achieve the desired results.
I also love racing games. They can be challenging, but also do not require the dexterous movements of controlling a character. Provided you have a wheel. All you have to do is steer, and work the pedals
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Conceited