Totally agree, Paralympic athletes are incredibly inspiring.
Gels at 6 and 12 miles is a good strategy, but I prefer to fuel beforehand with a light meal and snacks during the run.
I've run in -20°C and I can tell you, it's not about being a hero, it's about not losing a toe. Yeah, you don't need all that gear, but a good pair of gloves and a warm hat can make a huge difference. Don't be that person who thinks they can tough it out and ends up with frostbite.