Well, i have never _really_ used it myself. I do however use both OSX and linux and seeing how OSX is based on bsd i can say i kinda use it. To be honest, i think that they are generally similiar, but only because i don't really know much about bsd. I can say that the command line is much the same in linux as it is in bsd so that feels fairly transparent to me. Maybe i will try installing a bsd and get a better opinion.
There seems to be more and more BSD zealots shooting their mouths off recently(see slashdot)