Let's say you have a validation function that matches a string with a given regex, and you need to use that same logic in several places, using a different regex. Currying allows you to write something like this:

validate :: Regex -> String -> T

validate r s = ...

validateIpAddr :: String -> T

validateIpAddr = validate ipRegex

validateZipCode :: String -> T

validateZipCode = validate zipCodeRegex

And so on and so forth. It can reduce boilerplate, and lets you do stuff like map partially applied functions to functors.