Yes, it does work. However, it is not nearly as effective as a mister, but then it doesn't get the substratum as wet either. You can easily make one of these though. Also, I saw a design which would require the use of a false bottom, or other water source inside the tank.
1 way check valve (available at any pet store)
Air line "T"
Run the airline from the pump, into the tank, and down into the water source. then connect the T , and then on the parallel side of the t, connect the 1 way check valve, and make sure it is fully submerged. THen, on the perpendicular outlet of the T, have a line that runs upwards to the top of the tank. THis makes more of a rain effect, but it does work decent, and will definitely help with humidity. I can't remember the website I saw this at, but I can find it. PM me if you have more questions.
Yes, a drip system would work, and I am sure the darts wouldn't mind it, however, you have to have somewhere for all of the excess water to go, such as a drain, a false bottom, etc. With my "rain" system idea, you can run multiple lines, so it is not just coming from one point, or line, you know. A mister is definitely the best way to go though, but the most expensive.
Lars Osterdahl in Sweden breeds his azureus using what he calls his "frog jacuzzi". This is an aquarium airstone attached to a reasonable size airpump placed in the water dish. He lets them dry out for a couple of weeks (no spraying, water dish in tank), then turns the air pump on and they spawn within a few days.