I find that what is needed depends on the task. Mostly, it's about whether you need to switch views on information frequently. If you're working in a maximally focused way you already have the right info, so you don't have to make the view more diverse.

Two monitors can be really helpful if you're in a situation where you need one view to always stay the same(e.g. reading one document while editing another) and the editing app is some fussy internal thing that always wants to be on the first window when started, but I also haven't had that setup in quite a few years. Tiling can get you 80% of that if the screen is sufficiently large and the software cooperates.

When in Windows I stick to using the Win + arrow keys shortcuts to tile; in Linux I've used a few different WMs over the years but lately have been using Ubuntu defaults and basically working with it like Windows.

There is a lot of utility from not relying on screens and using a small gridded or ruled notebook with a spiral binding as the second screen. Mark it up with color multipens and sticky notes, and take it around in your jacket pocket or a belt bag.