If it were true that 'hard sciences' require a great deal of rote memorization and strict application of formulas, I would agree with you. However, it's actually the 'soft sciences', such as biology and the social sciences, which require memorization and formulaic application. The hard sciences are all about math; that is, they are all about derivations of formulas. Hard sciences, when well taught, are all about analysis.
Likewise, strong Humanities/Literature/etc. programs are about analysis (and theory), and they can be just as challenging. I think we'd both agree that classes based on memorization (low level science, low level humanities) are easier than classes based on analysis.