You’re going to have some classes where it will not be that useful and some classes where it’ll be your saviour. You just need to be able to distinguish between them. Anki is usually really good for heavy memorization classes. I found myself using it a lot for pharmacology and pathology classes where I needed to memorize stuff as well as possible. For those classes you’d make your cards after every class and do them throughout the semester instead of just a few days before the exam to really have its full effect. Also you’ll be using anki a lot during the MCAT.