Medical education has changed since the old days...by quite a lot.
I'm only a 2nd year, but now almost halfway through clinical rotations I can say that you can probably go all through your med school days without cracking open a single textbook. However, that doesn't mean that the workload is any easier, rather, it just means there are more effective study tools.
The holy trinity of studying in med school I would recommend is:
1. Some method of spaced repetition that promotes active recall. Anki is a go to.
2. Some form of practice question. UWorld, Amboss, etc.
3. Some form of 3rd party material. Boards and Beyond, Pathoma, Sketchy, etc. First aid could technically be classified as a textbook, but I view it more as a really detailed medical encyclopedia that is boards focused - something you'd never read cover to cover, but something that can make finding information in a pinch easy.
*NOTE* what I say here is most applicable for 3rd party/NBME style examinations; for in house/professor written examinations, their powerpoint are king. I'd still encourage 1 and 2, but 3rd party resources become less important
The good news about this study strategy is I believe it is transferrable to almost any subject, medical or otherwise.