I am not a starch user, I've tried it. I have friends who are believers but it doesn't work so well for me. For one, I can be sensitive to scents. "Sensitive" isn't a full blown allergy but still, can affect me.
Two, I don't feel the need, but I am (partly because of those scents) a believer in pre-washing and I then iron the heck out of it. I've seen some people try to use some floppy/wrinkled not right stuff and maybe for them starch is the answer. Me with a hot iron and steam and sometimes a mist, my after-washing fabric can be hard to tell apart from fresh on the bolt.