I love Bento. I didn't need anything as complex as FileMaker, although I did use that extensively back when I had my Mac Quadra, but after that died went to PC's and now back with Mac.
As for Bento, I keep track of a Photography Club from work that I am the membership chairman of, I have special files for vacations that I am planning, vacation diaries, auto maintenance records, recipes. and I love the label printing features.
I am constantly finding new uses for this application that I didn't think I'd use it for. Sometimes just sampling or looking at one of the many available templates on the bento website sparks a new idea or usage for it.