i do it once or twice a year.
1. a pleasant mental vacation.
2. an actual experience of joy and euphoria in an otherwise pretty stressful life
3. a great opportunity for calm and deliberate introspection without having to become too emotional over it (because the overwhelming joy overrides it).
it made me less of an asshole and it reassures me when i need it and helps me decide what "each year is gonna be about."
i have friends that do it every when they go to parties and i think that's retarded. it a) doesn't work if you do it too often and b) you're just banalizing an otherwise intense experience.
all in all: great experience, though my opinion is entirely subjective.