You'd be surprised how much you learn by doing. I'm not saying you need to constantly manage a 20 pt team, but as an intern you're gonna be in charge of getting notes in, taking admits, and writing orders. You will learn to become efficient at this process and eventually it will take you about 1/3rd of what it used to.
When you do you will begin to notice how to identify patients that are actually sick vs. those that are stable (you may think you know this now, you don't). Then you'll start to notice how a pyelonephritis with obstruction admission becomes almost routine. Then that patient will go septic on you and you will run to the RRT to see what you missed.
Each time something happens you have an opportunity to learn. Patients don't read the text books or care about your nightly research. Learn from your colleagues and consulting doctors. Read their notes, if something makes no sense, take 2 mins and look it up, then you'll know how and why to do it next time. You don't need multi-hour daily chunks to sit down and research about everything you do. Your attending will ask you questions you won't know the answer to, it is now okay to say "I don't know" because that's what they're expecting and they want to teach you.
When you become an upper level you will have more and more time to spend learning the cerebral portions of your work. You'll have more electives and you get to manage the interns that were doing what you did before. You will also prepare for the boards and become the most book smart person in the world.
Derm is potentially 9-5, but that is filled with 5-10min outpatient visits, all day every day. They see thousands of rashes, moles, weird things, etc. during their training. You should want to do the same, except your problems will consist of more than make it more wet/dry so they will inevitably take more time, thus you need to be carrying a larger team so that you can see what you want to see.
I will leave you with this: Picasso is sitting at a bar and a lady walks up to him with a napkin. She asks him to draw something for her. He spends 5 mins and draws something decent on the napkin and turns to the woman and says, "That will be $500." Outraged she says, "$500!? That only took you 5 mins!" To which he replied, "Madam, it took me 30 years to learn how to do it in 5 mins."