There's nothing about Go that makes GUI programming hard, it just hasn't taken off. Probably because maintaining bindings isn't fun, and bindings are rarely pleasant to use (impedance between C and the host language). And writing a decent GUI toolkit from scratch is a huge amount of work. Besides, competition from web apps and things like electron is eating GUI apps' lunch, regardless of programming language.

Go is a general purpose programming language, so it's suitable for basically anything in the Java/Python/.Net world modulo availability of libraries.