Perhaps I just forgot how leveling is, and no this isn't about leveling in Wrath being too hard or too slow.
I just find my spriest (currently lv73) to have to refrain from using some spells too often otherwise he's constantly struggling with low mana. That's inspite of Shadowfiend and Dispersion. Thus I'm feeling "slowed down" by that.
What's your take? Is mana an issue for you?