I just reversed my decks as well, and boy-oh-boy was I taken aback at two things:
1) Damn. I just doubled my workload.
2) Double-damn. I don’t know the answer to half these cards–so, really, I’ve pretty much tripled my workload.
But here’s the thing–if I don’t know these words backwards and forwards, then what’s the point in doing any of this work at all if it’s half assed? Once I get the words perfect in my mind the reviews will get easier. Sure, eventually you’ll probably learn it all if you memorize in just one direction, but that’s going to take a while, I think, probably longer than just working on the reverse decks as well.