I always find it interesting that some people never experienced the problems we've been having when we started roleplaying without minis about 25 years ago. No matter the system, there were always heated discussions about who was standing where, when things started to get rough.We don't use them at all. Found no need for them in classic D&D and every edition up to and including 3.x - I've only played 4e once and did it without minis so I can't see switching to using minis in our RPGs any time soon after 30 years of gaming without them.
We started by making sketches but soon realized using minis (or tokens) was a lot easier: Even if we just used the minis to indicate marching orders or the general location of characters and monsters without caring much about distances or movement rates, it helped a lot to clarify ambigious situations.