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I can't help on the Cata dungeons. I upgraded to Cata last week and been working 80+ hrs/week = no 85 teams yet. I got my guild to L8 on doing 80 dailies/dungeons. You can que for wrath dungeons untill you are 81 btw. I have maxxed points on one team ready to buy gear once they hit 85.
Edit: Throne of Tides can Kiss My A$$.
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I don't know that I'd call them harder, but there's a lot more to deal with in Cata dungeons. A lot of running around, switching targets, CC-ing and interrupting and the "cleanse or move out of owie crap" is less forgiving. There were only a few things in Cata that I felt I had to overgear to succeed. In Wrath, I felt I had to overgear just about everything and in quite a few places, no amount of overgearing was helping.
I'd probably go with "more sucktastick". Not hard...hard I can overcome with practice and maybe a little gear. Because of that, I've just canceled all my accounts again.