Here is an image from a workshop in Yellowstone National Park (Wyoming). This was the first day of the workshop, and we had gathered at Mid Geyser basin to practice using GND filters and work on composition.
This shot works well with a GND filter, since the horizon is nice and straight… but instead of using my GND, I bracketed 3 images and then blended them later using our iHDR workflow. Why? Because I let one of our students use my GND filter. :) I prefer to get the shot right in-camera if I can’t, but in a case like this, bracketing works just fine.