They turn snakes into long pieces of beef jerky.
LMFAO! I can just picture you saying that, so I laughed fairly hard. From the context, I think Jeff is either suggesting that acquariums do not hold adequate moisture levels, for the most part, unless altered. If not, he may have thought you said why don't you put the heat tape inside the cage.
As far as which to use, I personally feel more secure using Exoterra heat pads. They are expensive, but they are great and CSA approved - unlike flexwatt. This is often impractical with several cages, unfortunately.