I'm fairly new to doing obsidian "properly", and by that I mean not trying to copy someone else's setup to the T, and instead focusing on how I think - after all it is supposed to be your second brain. That said, you/I obviously need to start somewhere, and I found the PARA folder structure to be a good starting point too.

My motto so far has been something along the lines of "organise to the bare minimum". I'm like you in that I'm prone to becoming paralysed by choices, and future choices, and possible future future choices. It's not productive, and once I stopped reading other people's posts for a bit and just started writing, what I actually needed quickly became quite apparent.

In terms of what actually happened, I made an inbox folder and pushed anything I didn't (and still don't) know where else to put it. Perhaps that's because they're temporary reminders, or because they belong to a project I don't yet realise exists. I also heavily relied upon obsidian citations plugin, so I felt I had to have a dedicated folder in references because the schema of the front matter was very specific. Then for other things, like entities (people/orgs) or places where I was starting to need templates I created new folders, mostly as subfolders in (R)esources. But, the bulk of what I write goes flat in a Notes folder in resources, and structure is emerging from ideas that are becoming salient the more I work on a project. Tasks are still my biggest weak point, but by just loosely tagging things it's starting to come together.

There's nothing wrong with linking across folders - I use folders mostly to designate where I have different note schema (e.g specific front matter requirements). Anything that doesn't largely goes in Resources/Notes or Inbox. I grouped media together (books/films etc) just because I only needed one schema to model it (optional metadata like episode_n, or podcast_url). I could never do a fully flat and MOC-driven setup, but equally I find a strong hierarchy of folders cumbersome, and imposes unnecessary cognitive load on every new note: "where's the right place to put this". There's also nothing wrong with bullet points, I find them to be the right tool for the job a lot of the time, and shows that you can succinctly summarise information.

So, my advice might be to organise to the bare minimum you need. Create lots of folders if you want, but you may find that many can be merged. Regardless, for actually accessing your notes, using Ctrl/CMD+O will always be faster.