Applying the brakes shifts weight from the rear wheel to the front one, irrespective of which brake you apply. Because of this, the rear brake can never give you anything like the amount of braking that the front one can. Your main brake, therefore, is your front one, just like on a motorcycle.
Given that the only way to stop quickly in an emergency is to use the front brake, I am glad that the front one is on my right hand, and that I have got a lot of practice in using it so that I can minimise the chance of getting into a skid. It also helps that the modulation on the hydraulic discs is superb.
Apart from using it to hold the bike on a hill when stationary, I think I only really use the back brake to slow down if I'm indicating with my right hand, and then I feel I have to be very cautious to avoid locking the back wheel in the wet, even with the control that hydraulic disc brakes provide.