To know that 0.32 m is smaller than 43 cm I have to actively think, but I'm guessing you don't. I've never had to think about 3/4 vs 1/2. Even 5/16ths vs 1/4 is intuitive for me.
When we use fractions for measurements, the denominator is virtually always a power of two. The only one I can think of that isn't is a fifth of alcohol, which is really just its own unit at this point.