Do people browse arxiv or monitor new posts like reddit or something? I only visit when I encounter a link to it or when I search for a specific paper.
Yes, people do that. Karpathy made a utility to monitor it better years ago: https://github.com/karpathy/arxiv-sanity-preserver
I use the RSS feeds to watch for papers mentioning terms I'm curious about, do a casual skim for anything interesting and maybe end up finding a paper per month or two that are useful to read more carefully. Lots of chaff for sure, but if you have some core interests it's quite useful.
A bit too big and varied to browse, but you can get emails of all recent papers in your field(s) of interest with something like Scholars: https://app.scholars.io/newsletter I subscribe to "Functional Analysis" and get a weekly email listing 30-40 papers.
Yeah, it is not too uncommon that people visit the new listings (or subscribe to the email version) to (try to) keep track of what is going on in your field.
Supposing of course your field roughly matches one of the categories.
RSSFeed yes
I’m RSS-subscribed to a few sections relevant to my research.
It depends on the kind of people. Most normal people don't do that, it's not a reddit-like platform after all.
But most researchers and grad students (like me) often subscribe to daily mailing list of the papers dropping that day from their particular field. Having a cursory read at the paper titles and then opening the papers further relevant to you is a morning ritual for many.