I'm with you, I really enjoy learning just for the sake of learning and feel very lucky that I get to live now, when there is almost always a rich lode of existing research that I can read on almost any topic that strikes my curiosity.
Yes!
And it highlights how people these days aren't any smarter than the people in times gone by. We just have a greater pile of existing knowledge to mine.
I also end up writing essays about what I've discovered, basically as a means of having some sort of "goal" for the research.
1) pick up a topic 2) do a literature review 3) establish a baseline and state of the art 4) improve upon model until you beat state of the art or find something interesting and unusual 5) publish
I still find libraries pretty useful while simultaneously being amazed at the quantity of papers online - I have found papers I would have nearly killed for decades ago now online at faculty pages of my favorite researchers. I'm guessing online is better for most, especially when coupled with browsing faculty pages for the author of your random linked papers. Also, look for citations listings that include authors of papers You like (it's printed and at your local research/eng lib for older obscure authors).
Before Eternal September and still today (though maybe less?), sending an intro email to someone that is studying a subject You are interested in is often useful (possibly better for niches). I'm guilty of not responding in a timely manner.
Probably Semi-OT: look at some indexes for CoEvolution Quarterly.
A million times this, and the value of libraries. There is a vast amount of information online, but the amount that isn't is still even greater.