As for healing in wotlk on my paladin I largely spammed one button. A couple of cooldowns (loh, defensive cooldowns) but not only did I basically ignore mana as a resource I literally had one go to healing spell and no additional holy power as a resouce to use. IN so far as shamans are concerned they've just been given a battery of cds to use and keep track of. The complexity is still there. The simple fact that mana matters means that healing is far more complex. Even that alone is proof of that. I didn't heal on a shaman in wotlk though so I can't know your specific case. I did a bit in cataclysm mind you but I have no way to compare.
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The game is not easier then ever and certainly not casual friendly or rewarding as ever. It was far easier in wotlk when I didn't need to raid and didn't have enormous ability bloat and complex procs and rotations.