Do you mean the short-term memory needed to apply the commutators or the conjugates? Otherwise you only really need to "memorize" the steps of the method.
I learned this method around 10 years ago, and I can still solve the cube without applying any memorized algorithms because of it. It really is the only fun way for me to solve the cube after all this time.
The Heise method might be a great fit for you. Unlike most methods, it requires no memorization. And, unlike most methods that require no algs, it can be quite fast. AND it forces you to learn about how the cube actually works and to think in commutators and conjugates: https://www.ryanheise.com/cube/heise_method.html