Fair warning, that was my original plan as well.
I still have a grin on my face when I walk into a room and the lights go on automatic (my XAP800 should arrive soon to add always-on voice control; for now I rely on motion sensors).
Thought for sure that would get old quick, as is usually the case with 'new' stuff for me. The only thing that is slowing me down is that I have a certain vision on how I want full home automation, and not everything is available yet (Aeon-Labs window film for example).
It is already saving me money. Granted my Z-Wave network is adding up quick in the amount of power it consumes in idle mode (over 40 modules now), but it made me quickly discover my Canon AIO was consuming 14Watt idle, Onkyo receiver 53Watt, and XBox One 17Watt. Even small ones such as Microwave (3 Watt), Keurig K-Cup (2 Watt), Gas oven clock (2 Watt), etc. It all adds up, and is more then what all my Z-Wave modules are consuming.