Unless you're never doing new development you can't automate them. The kinds of tasks I've used this for:

• Making an HTML visualisation of some complex function inputs. One-off project. I could totally do this but it would take me way longer.
• Formatting a complex and very long SystemVerilog file. There aren't any existing SystemVerilog formatters (and certainly none that would handle the insane level of ifdefs in this file).
• Writing a script to delete all Git branches at a particular commit. I only used this once.
• Writing an Asciidoctor custom annotation. I don't know Ruby so...

You can't automate any of those.