I've only had a rangefinder since February this year. I use it most of the time now but I still find SLRs fun, and they have certain advantages:
1. When you want to use a wide (24mm here) lens that you don't have for your rf, and/or you want to use filters more conveniently:
rio grande bridge near taos, new mexico (yellow/green filter)
ranchos de taos, new mexico (orange filter)
2. Also, when you want to shoot with a film you don't have loaded in your rf, such as portra:
las vegas, nevada (50mm).
All were taken with an R8 - not nearly as portable, light and convenient as an rf, but exquisite.