Worth the walk
Most important of all: The Esplanade address listed above is WRONG! That address is cemetery #3, and a long way from the French Quarter. #1 is on Basin St, and an easy walk from the French Quarter. Bad Yahoo!
Interesting place to visit. I'm not sure it's worth $20 a head for a guided tour, though, but you will hear some interesting stories, some of them probably made up. If you're in the French quarter, walk up there and check it out, and then decide if you want to pay for a tour. Admission is free if you don't go on a guided tour.
And be sure to look somewhere other than here to find the correct location.