I would have gone crazy without carriers. I am active and like to be doing something, and by wearing my baby I can still do a lot (albeit slower).
I used a moby until he was about 15 lbs, then it didnt work as well. Now I have an ergo that I love. Check out Diaperswappers.com people sell used carriers there. If you stay on top of it you can get one for a very reasonable price. I think mine was $50.