Use it. Don't be so afraid of it that you don't. You need the stopping power, and most of it comes from the front brake. It's just physics. I got through I don't know how many miles in my lifetime, but over 40,000 miles for sure, using mostly front brake and believing that it wasn't possible to endo under braking, until I finally got caught out. Not being able to stop fast enough is a much more common situation, and you don't want to make that any more likely than it already is.

The only thing I'm working hard to change is not reaching for the front brake first, and being sure to shift my weight. It's important to use BOTH brakes.