Hot glue definitely does have its uses.
I use hot glue all the time to hold down wiring on a lighted model. This keeps it routed, organized, and out of the way. If it pops loose after the model is sealed its not anything to worry about.
I've also used it to reinforce joints/seams, like the pie shaped sections on the huge Jupiter 2 model. Time will tell if this helps.
Now, I DO NOT use it say to glue together two halves of a hull or fuselage.