playing 1.0 to now, I'd say HW increased difficulty in all categories from 1.0/2.0
SB may be considered easier than HW, but only by a small fraction.
If anything I was suprised they increased difficulty in the more casual content.

The main things to be really effected in "made too easy" are healers.
Thats mostly it really. (the small exception of taking the most complex tank, and making it the least complex tank, and the other 2 being medium complexity, in comparison. and having RDM being easiest, followed by having SAM being mostly easier than the other melee.)

As soon as I read the title, my 1st thought was, the OP must be a healer, to be now saying anything about difficulty. (sure enough...)