I use my MacBook in all three of my A2 subjects, Psychology, Geography, and Business Studies.
In exams, I am allowed to use a word processor as well as getting 25% extra time because I have Dysgraphia and Dyspraxia, but a condition of this is that I must use a computer as my primary note taking method in all lessons.
In Psychology, all of our notes are written, with no graphs or diagrams, so I just copy it in Word. Geography is mostly the same, and thankfully our teacher prints off any diagrams/graphs, so I don't need to copy them. In Business Studies, all our notes are printed off for us anyway, so I only use my MacBook for answering questions.
Using a laptop doesn't distract me in anyway as there isn't any insecure WiFi within range (which is odd for central London). It's also really useful having my MacBook with me because I can do my homework in the library in my breaks or on the train. I never have to take my charger because I can just manage a whole day on a single charge. And yes, I still have to bring textbooks, and folders for each subject.