My first quilt was tied, made about 5 years ago. Since then, I've become enamored of machine quilting, and that's mostly what I do (with occasional forays into hand quilting).
Tying is all my mother and grandmother do. I really prefer the look of quilting, but if I needed a kids quilt in a hurry, I would tie one. I think it is good to know as many techniques as possible, so you can pick the right one for a particular quilt. I think tying would be good, for example, on a thick wool winter quilt. I've seen some great vintage ones like that.