it's not for everyone, for sure. The whole concept requires planning, and initial work to create the gardens. It's cheap(er) because you're using materials you have on hand (compost, cardboard), and once the gardens are going it's little maintenance.
The lasagna method is super effective at moisture retention, which helps, and we're selective about what we plant and where to minimize maintenance an maximize plant health. We have four 55 gallon rain barrels, and for areas that require more frequent watering we're attaching either drip lines or just attach a hose, open the spigot, and let them gravity feed (they're up on risers).