I'm quite familiar with "Grad Student Reading" and have done my share. In fact as long as I attended classes regularly I found that I didn't need to read as much as was assigned. I too generally skim modules I'm considering to run trying to get an idea of the quality; if something jumps out as either really good or really bad. That usually takes a little more scrutiny and in-depth reading though. I find any of the D&D rulebooks, (excluding settings and other types of supplements) just too dry to read cover to cover. I tried reading the 5E PHB about two years ago and I go half way through the class section and gave up. I think by reading what I need in smaller pieces I've eventually read most of the 3 core books of the all the editions I've played over the years.You need to do a little "grad student reading," by which I mean the approach to lots of reading I learned in grad school: professors assign a lot more reading than you can literally get done in the allotted time, in addition to your own independent work and reading, so I got good at doing the kind of reading that familiarized me with ideas and let me know I needed to dedicated more time to reading in depth or moving on.