I started using glue for applique the landscape quilt I'm working on. Fantastic ... if I don't like it I simply lift it off. I use the stick as I find it much easier to work with.
And yes, thinking when I do regular piecing again (when I finish this quilt) glue is a fantastic alternative especially for piecing strips.
No pins means: no holes in the fabric, no pins that I have to remove lest I sew on top of them, no broken needles, no fallen pins on the floor (room is carpeted), no pricked fingers or tongue (yes I keep them in my mouth), faster sewing time (faster to match strips plus I don't waste time removing pins).
So I really don't care how long I've been out of school. If we went by the theory of "it wasn't done back then" then we might as well give up our machines, our rotary cutters, all of our fancy specialized rulers, and ... the QB.