It can be. As with other terms and expressions, there are other ways of saying it, but this one is simple and commonly used and understood.

I'd stick with cyffrous, I think... If somebody was excited as in 'agitated' then perhaps cynhyrfus/cyhyrflyd/berwedig. If excited by something, then maybe even wedi cyffro/cynhyrfu.

In the wild it doesn't really come up as a problem - there is a context of some sort.