I believe fuzzy logic, or something similar, is used in some handwriting recognition software. E.g. as you are looking at a letter, you start with "This letter is an A" as having value 1/26, etc... and start to change them as you look at it. In this case its very similar to probability. I'm not sure of any other uses.
However, I remember reading studies that seemed to indicate that apes/chimps use fuzzy logic. I don't remember who wrote it or how they tested it, but it seemed fairly convincing at the time.
So, I guess I'd say its not so useful now (at least not as an independent concept) but if its true that humans use it, it might become useful in the future.
In the end though, fuzzy logic isn't going to solve your problems for you, at least not alone. The way you use the fuzzy logic is going to be much more important.
However, I remember reading studies that seemed to indicate that apes/chimps use fuzzy logic. I don't remember who wrote it or how they tested it, but it seemed fairly convincing at the time.
So, I guess I'd say its not so useful now (at least not as an independent concept) but if its true that humans use it, it might become useful in the future.
In the end though, fuzzy logic isn't going to solve your problems for you, at least not alone. The way you use the fuzzy logic is going to be much more important.