I'm in the middle ground here, between the outliers. I am a wide-angle guy, but I remain mindful there is such a thing as too wide angle. I use 15mm, 18mm, 20mm, 24 and 25mm, 28mm, 35mm, 40mm. I have them all. I'm not likely to use anything wider than a 24mm for a landscape. For one thing, a too-wide lens is likely to pickup something I don't want in the composition, such as a utility pole or a road. Even in an area of the Colorado mountains, accessible only with four-wheel drive, there was a weather station that got in the way of using a 20mm.
For another thing, the preceding posts about the way the wide angle view emphasizes the foreground should be studied. To use a very wide lens, you must have something interesting in the foreground! And the foreground should be an integral part of the composition, and not just "there." An exception could be when you are going to crop out some foreground and some sky, to create a wide-screen CinemaScope look.
I use my widest lenses more for cityscapes than for landscapes. But my most successful wide angle shots have a "you are there" look that puts the viewer in the scene. This is most successful when the picture is projected onto a large screen (or I suppose in a very large print). I'll see about posting a couple of examples.