I had a stand-alone electric kettle on my countertop for years because I drink a lot of tea, and it's so much faster than heating water on the stove or in the microwave. If I'm cooking pasta or hard-boiling eggs, I'll start by boiling water in the kettle to make the whole process faster, then pour it into a pot on the stove.

I'm passionate enough about having nearly-boiling water available at all times, that when I remodeled my kitchen, I put in tea spigot: a tiny water heater under my sink that keeps water nearly-boiling and ready to dispense at all times, with a little dedicated spigot built into the sink. So now I don't have a kettle on the counter, but only because it's built into the sink.

If I had to guess, it probably gets used 5+ times a day.