Here's one risk to upgrading your lighting to higher efficiency fluorescent (or CFL, or LED): People don't worry as much about turning off the lights any more. See this blog posting for a comment from an actual user of a Cree LED fixture - "I don’t worry about turning them off all the time." I think it's a lot like the "sugar-free" syndrome. If you get a "sugar-free" or "low-calorie" food, I think people tend to eat more of it.
I think automated control systems help keep unused loads off any time they are not needed, but I'm rather biased, since that's what I design.