My first 4x5 was a Speed Graphic with a 127 mm Ektar. So, as a result, all of my first LF pictures used this focal length only. While a fine lens, I didn't exactly care for the composition of my photos given the lens and my typical subjects (B&W landscapes).

Eventually, I added a new 4x5, with 90 mm and 210 mm lenses, along with an 8x10 with 159 mm and 355 mm lenses, as well as some various paper weights that never get used. Only the 210 mm could be considered "modern".

In 4x5, I find that most of my images are taken with the 210 mm. I think the reason for doing this (besides the fact that it is of higher quality than my other lenses) is that I feel that with a wide angle, everything will appear too small on the film and just get lost in things like the mountains in the background, the sky, etc. When I do use a wide angle, I typically use it as a close up of something interesting, where I can go right next to the subject, where nothing in the background or sides really dominates or takes away from the subject.

With 8x10, on the other hand, I use the 159 mm a lot more than the 355 mm. This is partly due to the sizes of the lenses the 159 is very small, but slow, and I like to hike around with it, while the 355 mm is big, fast and coated. With the 8x10, in comparison to the 4x5, the image size seems so much bigger, that I feel I can get away with my concerns in 4x5. I probably include a lot more background in 8x10 than 4x5, but my subjects are a lot bigger on the 8x10 film and easier for me to see on the ground glass.

While film size shouldn't be that much of an issue if you're enlarging, I only do contact printing in LF, and to me the negative size makes a big difference. I too am truly impressed by what photographers such as Muench have done with wide angle lenses, but to me I am often trying to worry about one or two particular subjects or points in the scene while keeping everything else in focus using the cameras movements. I find that this is easier for me to do in 4x5 with a somewhat longer lens, and with a bigger image in 8x10, it is easier for me to fit the subject with a wide lens and setting up the tripod close to the subject. I seem to be at home using both of these lenses in both of these formats in both close quarters and distant shots, however.

If I had more lenses, this might change things, but even with only one or two lenses in my pack when I go out to take pictures, I never really say to myself "if only I had a wider/longer lens for this scene." I can usually make due, and always walk up a little closer or farther away if necessary.