I think it's more a matter of Wrath had the advantage of seeing the results of your efforts much sooner. Cataclysm overall is a much more difficult expansion. I think it's more a problem of you hit a wall where most of the time you log out in the exact same situation as you logged in, like you hit a wall already. The shared raid lockouts, the difficulty of raiding in general, the relative difficulty and time commitment of heroics. Everything is a bit slower paced in Cataclysm once you sort of hit that wall wherever that wall is for you individually. Looking at the gear I logged out in personally and the recent history of my character, it's been basically two full weeks since my last upgrade (I've gotten stuff in between but mainly just side grades). I think this may be something to do with how you are feeling. It isn't so much that there isn't stuff for you to do, but rather you feel like whatever you are doing isn't amounting to much because you aren't seeing a real benefit.
Things hopefully should start to pick up a now that the holidays are behind us.