Thanks for your input everybody. I know from my description this contraption may be hard to envision, it would look somewhat similar to a humidifier w/pvc setup, except the piping would flow back into the resevoir, and instead of a humidifier imagine a 5 gallon bucket. Simply drilling holes in the pvc may cause more than just a drip or two a second, which is what I envision. You may need to set it up so it has valves similar to what you see in small chameleon drippers.
Good drainage would be a must, but no more so than those of you with misting systems. Currently I use a 32oz dripper, thats 1/4 of a gallon for my jacksons chameleon, at one drop per a second it runs for at least 180 minutes. Now let's cut the duration of that down to 30 minutes it would only put out about 5oz of water. Now if I had 20 dripper sites running at one drop per second for 30 minutes I would only put out about 100oz of water, about 3/4 of a gallon. Do that twice a day, hey why not go three times a day and you only get about 300 oz of water, or a little over two gallons. Maybe my 32oz dripper puts out less than a drop per a second and that's throwing my math off, but not by too much. At three times per a day for 30 minutes per session your drainage problems can still be solved by a $2 5 gallon bucket or similar sized rubbermaid placed under your cages drain.
Lowendfrequency your system is much more efficient and I'm not trying to bad mouth misting systems especially not when you're talking about a larger number of cages. You said you run your system for five hours a day, you must have some nozzles that create a very fine mist with a very low gph rate. Are you using a Promist system? Regardless of the brand of your system you said you're running it for five hours a day, I'm assuming the 6 nozzles are for 6 different cages meaning each cage is getting 5/6 a gallon of water, which is more efficient than my ~2 1/4 gallons, but not enough so to make this idea impractical. You're system probably keeps a much more steady humidity level as well.
My main interest in this is for chameleons who don't like me shooting them with mist and don't seem to want to have to seek out a dripper. I've never seen my jacksons seek out his dripper and drink from it, but he loves showers,drinks like crazy in the shower. So to reduce the stress of handling this already shy chameleon and taking him to the shower 3-5 times a week, why not bring the shower to him? Maybe a misting system is the way to go especially since I plan on expanding my collection, but I would like to see some more thought put into this before people start saying its impractical.