I also am a convert to glue basting. Why? No more pinning and sticking or straining my fingers. Also, it holds the sandwich in place better during quilting. Some people use "dots" of the glue, others (me included) make "waves" or "/\/\/\/\/\/\/\/\" across the batting. I don't iron, I let it sit overnight.
Many people try in out on a small project first. Just be sure to use WASHABLE glue. It doesn't have to be Elmer's, I use washable school glue from the dollar store (two for a buck).
Tate