I'm a sling/wrap mama, myself. For my firstborn (he's 14 now) I had a carrier. I HATED it. It was so unnatural, and HE hated it. When I got pregnant with DS #2 I said "NO CARRIERS!" and searched for something better...Found the over the shoulder baby holder. Still love it, six kids now (and have my original to this day!). My personal FAVORITE, though, is the Maya wrap. I got that with my 4th baby.
Wraps and slings work perfectly with older children. My 18 m/o is still in hers, and my husband will even wrap on my 4 year old daughter sometimes, if we're going to the zoo or something where being "up" would be helpful to her.
The security of being in a sling/wrap is wonderful for baby. As they grow older, you just wrap them up differently, and they love that, too! I would just wrap baby to me and go about all my housework as usual, with baby right there and calmly sleeping. :)
Do try a sling or wrap and decide for yourself, since you've used a carrier before.