I'm with the OP. The only time I use the rear brake is in dirt, and even then I try to use the front more. The front brake is your friend even off-road.
On the street I'll sometimes use the rear brake on slippery surfaces, but not much. In fact, If I used my rear brake on my old KTM 950 with any pressure, it would boil the brake fluid and be pretty much useless until it was serviced.
Take Daytona coming down from a buck seventy off the tri-oval and into the slow speed T1. You think anybody uses the rear brake?
How about Loudon in the rain into turn 3? Think anybody uses the rear brake?
I think the front brake is the one everybody needs practice with. The rear brake is a crutch.