You can use things like arxivsorter and benty-fields for this. You give them a list of papers you've published, or authors you are interested in and then get recommendations. The recommendations can be up and down voted to improve future recommendations.

Yup, I read the daily abstracts of Representation Theory (math.RT), Number Theory (math.NT) and Programming Languages (cs.PL)

arXiv advanced search is great.

I just have a few bookmarked searches for what I am interested in.

I don't see how you could generalize things though across all papers. Like randomly clicking on what was submitted to High Energy Physics - Lattice yesterday. I don't have the first clue what any of that is and that would be the same for most topics for most people I imagine.