Even if I have a 35mm eternally attached to most of my camera bodies (my two M5s have it, and so do my M4 and M4-2, and one of my M6TTL), not always am I able to "take it all" in the frame. Some times I have the need to tilt the camera in order to capture what I want within the frame.
All these photographs were made with my Konica Hexanon lens, with the exception of the 4th and 5th, in which I used a Voigtlander Ultron 28mm f2.
I do like the tilting of the frame; to me, it shows a slightly different view, less conventional, a bit quirky. Hence, I do it often, and sometimes even in vertical. If I find the ones I have in mind, I'll post them. In the meanwhile, let me know if you have done this, when and why.