What was I thinking? The condensation I described is driven by a decrease in temprature which is sometimes due to a drop in pressure, not an increase as I said earlier. The vapor you saw in the cabin was probably due to the crew setting the packs at a relatively cold temp, causing the water in the humid Florida air to condense and form fog. The example of the wingtip vorticies is also due to a drop in temprature, this time driven by a corresponding decrease in air pressure over the wing (remember Ma and Pa Bernoulli's boy). An example more readily apparent to those of us in the maintenance dept. is the fog that forms in the cabin while "dumping" the pressure built up during a ground pressurization run. Sorry for the earlier numb-skullery and if this explaination is full of holes, let me know 'cause I'm starting to get a little confused myself!
Thou shalt mind thine altitude,lest the ground reach up and smite thee.