A nice post about using creative lenses to get a different perspective:
I tend to find a similar thing – I see photos I can take with the lens I have on the camera, and don’t see photos that would require a change of lens. I think my brain knows I’m too lazy to change lenses, so it doesn’t bother telling me about what it’s seen.
I have a Lensbaby (Search for "Lensbaby" on: DuckDuckGo, Amazon UK, Amazon US), with Double-glass and Plastic optics, along with the Fisheye optic. I haven’t really had much use out of them, but they are strangely enjoyable lenses to play with.