Sleep does have another potential advantage in addition to its high speed resume. Hibernation envolves dumping the entire active memory to the hard drive(or SSD), while Sleep simply keeps the ram powered at the cost of a few watts. (My system uses about 8 watts in sleep with 6GB ram).
MLC based SSD's have a limited lifespan based on the number of writes, so hibernate just adds a bunch of unnessessary writes to the drive. Sure if you only hibernate once a day its fairly low level wear, but if you have your PC set to hibernate automatically, it could dump ram to the drive many times a day.
Personally on an SSD system I would either have a hard disk for the hibernation file, or use S3 sleep instead.