It highly depends on the job. Some companies run fully on Windows, no exceptions. There it obviously would not help. But many still either host various services on Linux, or buy hosting/cloud commuting that is Linux based. There it might even be necessary.
It also depends on what you mean by “power user”. I would generally advise you to look into the server side of things. In my work, there are zero Linux machines that have a GUI of any kind installed. t The 50 or so Linux machines are all administered through SSH and Shell.