I still find myself using various npm packages to build my code; check for syntax errors; linting; style guide adherence; bundle and minify css and js code. Task runners are a more improved way to automate these tasks. What tools are you using and how do they help with increasing your productivity?
I use one tool. CodeKit. It does everything you mentioned and some more.
About a year I use webpack, before that gulp, before that grunt.
I notice that Webpack in now number 1 and with the recent release of 4.0, I suspect they may remain the front runner. When I get some time I want to move an old gulp script to Webpack I would be a great learning experience to compare and contrast their respective approaches.