I've stopped buying music media. I also prefer to buy digital copies of games for the XBOX for a couple of reasons that involve two consoles in two houses on two different continents and also not having to insert disks into the game console. Most of the books that I have read in the past five years have been on my Kindle (or the Kindle app on my phone). It's compact and I tear through a lot of books while on vacation, so one Kindle is more convenient than many books.
Magazines, I prefer paper. Technical papers, I prefer to print them out rather than read them on a screen. I like to write on paper, make notes and corrections, etc. When I write technical papers, it's generally hand-written in pen on the back of scrap paper. Both of my theses were written in the same manner; back of scrap paper and then typed into the computer... then potentially printed out and corrected on paper before corrections were re-typed. I concentrate better on paper, and I prefer magazine pics on paper when I'm reading magazine articles (I subscribe to technical magazines).
As for "why?", it's probably an age thing. When I was in high school, the 486 processor was top of the line, and people used dial-up services like Prodigy, AOL, and Compuserve. I didn't have a computer in high school (or in undergrad!). I typed my college applications and resumes on a typewriter... on paper! Web browsers came into being when I was an undergrad, Yahoo was the premier search engine at the time, and Netscape dominated Mosaic. So basically, high school and undergrad were paper worlds. I guess it stuck.
The argument about "saving trees" is completely stupid, and I'm guessing that it comes from people who don't come from the South. In north Florida, Alabama, and I imagine many parts of the country, there are miles and miles and miles of tall, scrawny trees planted in rows. They're tree farms. No one is cutting down the goddam rain forests to make 2x4s, plywood, or paper. It's farmed trees that spent their life next to the interstate, and they get replanted as soon as they're cut down.