I think it stands up after all this time (no pun intended) because it's such a personal album that was heavily influenced by his fathers death in 1987. He also had a fantastic band that supported it live - two different tours (one completely acoustic, one more arena and rock based). A very creative period for him that really established him as a seriously adept musician that could hold his own.
The follow up to Soul Cages, 'Ten Summoners Tales', isn't a bad album. If you strip away 'Fields of Gold' from it, it's a lot deeper musically and subject wise than that song gives away.