Show me a pilot that has to rely on their instruments and I'll show a pilot who can't fly.
You're not a pilot, obviously. Every airline pilot has an instrument rating to ensure they can fly safely without external reference to the ground and horizon (when flying through cloud, a snowstorm, fog, or even at night over a sparsely populated area between cloud layers. You (usually) need an instrument rating to land through cloud and when conditions are below visual limits.
It is almost impossible to stay oriented in thick cloud without using instruments, because one of the side-effects of turning in an aircraft is that in a properly coordinated turn, the occupants of the aircraft will feel that they are being pushed "down" toward the floor of the aircraft. That's convenient and feels more comfortable than sliding out of your seat. However, it means that it's quite possible to enter an extremely steep turn that fools the body into thinking that everything is OK. Bad things can easily happen unless you learn to ignore what your body is telling you and instead rely on what your artificial horizon is telling you.