I would probably not advise anyone to take on a day at BG, the drive back and then expect to be in the sort of mood/condition to be able to enjoy a top class (EXPENSIVE) meal at the end of it. Unless you have remarkable levels of energy and concentration the combination of a full park day and 3 hours PLUS of driving along I4 is going to be draining on the driver if no one else.
I'm not sure if you can see any fireworks etc from Citricos. I can tell you that you can get a great view of the MK fireworks from Narcoossees and the food was excellent as well. Narcoossees has a slightly more relaxed "dress code" than V+A or Citricos (polo shirts and chinos as opposed to shirt, tie and dress trousers) , that might be a plus or a minus for it, depending on what you're looking for.