I noticed a huge drop in my ability to read long articles after being on reddit for so many years. Especially because of the whole "Didn't read the article, went straight to the comments" mentality. Even reading books that I'm not too interested in has become a struggle, especially when I'm in school. I'm glad that this community is discussion based, I'm trying to make a conscious effort in what I'm reading and this is a great change a pace.
Funnily enough i experienced the opposite. Before joining reddit I wouldn't read articles if they were too long, or books in general. This was mainly because the articles or books that i read didn't interest me, but after joining a number of subreddits i found stuff that i was interested in. Now i usually look forward to a 2000 word article, and I have a number of books that i wish to read on my bucket list. I do have to agree that sometimes i go to the comment section first to get a TL;DR of the article but at least now i do read more that before.