I recently watched "Uncle Boonmee" for the first time. I have wanted to watch this film since its release, but never quite got around to watching it until now.
It has an art film sensibility, but is totally respectful towards its characters and audience. The film provides insight (or seems to) about Thai folk beliefs on reincarnation and the afterlife, and on the role of Buddhism in Thai popular culture.
The film's theme is (largely) the great matter of life and death, not just the afterlife per se.