Weird, I have the exact opposite preference. I do like looking things up in paper reference books, but a lot of the time I remember context well enough that I can type a key phrase and have it instantly. I prefer learning from paper, so if it's a scientific paper that's too complex/deep to just skim and longer than 10-15 pages I'll often print it.

Reading for pleasure on the other hand, I will only do on paper. The physicality of the book, down to the wrinkles and texture of the paper, are part of the enjoyment.