As a newbie tank and veteran healer/DPS, I love this change. I agree with GC that threat was a mechanic that could make things tougher, but it wasn't a "fun" challenge. IMO, fun is managing your procs and cooldowns well, positioning and general awareness...not throttling your DPS to manage your spot on a threat list or tabbing around to make sure threat is being generated evenly as a tank.

Of course, as a newbie tank, I'm hardly the best at it so this may be a reaction of relief...the thing I found most stressful is going to be easier. I love tanking bosses, because then I can largely just worry about positioning and awareness. Tanking trash was always what was stressful to me, due to the number of things that DPS could potentially pull away. I don't know if most tanks find trash harder, but that seems backward to me.

In any case, I think worrying about tank cooldowns, positioning and awareness (which are mostly the tanking skills that matter in raids) rather than threat will be beneficial for newer tanks.