I use the word(s) pattern a lot when describing code where 'word' is some specific name so I don't want the plural 's' to confuse that. Writing thing(s) lets me talk about a group of thing instances using the plural w/o making the name confusing to myself.
I also obsess over whether to name something with the plural outright. This comes up a lot in table names. I tend to want to use the singular unless there's a reason not to.