The miniature species Bulbophyllum ambrosia is reported to be sweet smelling, some say 'like honey', but I must admit I found it more 'smelly' than 'sweet'. But it was at least fragrant.
This poor little plant gets a fair amount of abuse from me. Its a species that wants copious amounts of water and I just don't water it enough for it to be really happy (trying to change that, honest), but it muddles along and occasionally blooms for me. What a dutiful little plant. I divided it into several pieces after this blooming so hopefully will have some to share in a few months. Many bulbophyllums and cirrhopetalums are moisture loving. At the same time, most of them like lower light conditions, like phalaenopsis light, so are easy to accommodate in many homes. If you like to water a lot, you might consider trying one of these species.