We know WoW players care about the recent nerf and balancing very much. You must worry about if it will bad to your WoW Gold farming, or it will make your WoW Power Leveling be slow. Let read the detail about these issues, and judge by yourself whether they it will affect your plan to get World of Warcraft Gold.
Reasons of the nerf of Downranking
Blizzard is spending more and more of their design time trying to make sure that the lower ranked spells didn't always trump the higher ranked spells since with enough spell power etc. the coefficients start to matter a lot more than the flat value of the heals. They kept nerfing the coefficients over and over and could have kept doing that, but at some point they asked themselves why so much of our healing design time was spent balancing downranking when it was a pretty obscure concept (from a new player perspective) in the first place and they were having trouble getting healers to use their entire arsenal of spells.
Blizzard recognizes that there is some fun in matching the right heal to the job, and they would love to add some smaller heals back to the game, but first they have to get the balance right where huge, fast, expensive heals don't always win. Otherwise, offering players small, heals costing few WoW Money won't do anything.
Balancing Tanks
Tank balance was a non-issue in classic and BC (that's 4 or so years of your 5 years) because warriors were designed to be the best tank. In other words, Blizzard made no attempt to balance the tank classes, so beating us up for not accomplishing what they weren't trying to do seems odd to me.
In most cases warriors were the best tank. They were certainly far and away the most common. When there were situations that other classes started to outstrip warriors, Blizzard took steps to make sure the warriors still came out on top.
Philosophy in LK (and added another tank) are changed. Now all 4 tanking classes can tank any encounter in the game. It is closer than it has ever been in the history of WoW and is close enough that you have to be on a very cutting-edge encounter at the absolute limits of your capabilities for it to really even be a factor. Many of the world first kills and most of the cutting-edge guilds still use a warrior MT and obviously they're still cutting edge.
Make sure when you are making your "tanks are horribly impabalanced" posts that you have experienced those encounters first hand and aren't just replying with what you've read on the forums about how your class needs buffs. Blizzard is doing all things to provide you better game experience of fighting for Fast WoW Gold.
Two Basic Strategies for Balancing the Game
The first is that Blizzard just lets things go until major content patches (or even expansions). The other is they step in and make adjustments when they feel it's appropriate. Blizzard tried the first way for a long time, but it was fairly frustrating for classes who were behind or had other issues knowing that they would be that way for months or longer. They've been trying the other way more lately - making pretty rapid adjustments, though not always as rapid as some players would like. However there is a consequence that sometimes you'll get nerfed even as other classes get buffed, or you'll have to rethink your gear when some stat becomes better than something else. It's a two-way street. Now, Blizzard doesn’t want it to feel like a roller coaster or feel arbitrary in any way. But they also don't want broken things to just endure.
Whatever, World of Warcraft still is the game we love best, and Buy WoW Gold here can make us rich in game.