That'd be me. ;p Just curious, why is it so crazy to use orange or amber gel/filters/diffusers indoors? You are just trying to balance with ambient.
And it is a problem if you are bouncing and the ambient light is quite strong, for eg a very big chandelier with lots of bulbs, or lots of 2700K fluorescent. Its bright, but not bright enough and need a little bit of help from the flash.
It is not uncommon at all for wedding photography. The reason you don't see it sometimes is coz, well I am lazy to run back to the bag to grab.
But for places like Hilton reception area, Orchid Country club reception, you'd need it preferably. Not that cannot do, but i don't wanna blow my flash again and again (already blew a lot of them, tube wears out). You'd be thankful for the gel if you are shooting a few hundred thousand frames in your work.