Easier? No. Different? Yes.
Heroic dungeons now are a complete joke. As soon as you're max level you que and you might spend an extra 5 mins in them. Back in BC there was a reason that LFG didn't exist. People were still using things like CC. Also you couldn't just be a fresh 70 and hope to get into heroic dungeons because you probably weren't able to put out the numbers you needed.
Raids weren't extremely harder back in TBC, but like SoO there was a lot more put on individual performance so everyone had to be on the top of their game. There was no LFR hero type person back then.