I am far from a power user regarding the terminal. In fact, until very recently I even was a bit reluctant to spend too much time fine-tuning it, to avoid additional steps when I upgrade the operating system (often via format & clean install) or setup a new machine (like at work). But I also appreciate the value of doing certain actions quicker and easier, so now I'm leaning towards a "try and integrate if adds value" approach.
The list might be incomplete, as I am also gathering a list of everything I've got either installed or used not long ago, but the plan is to keep it updated from now on.
As always, additional suggestions are welcome!