I don't think I ever used ope, at least not often. When I was growing up I was always very interested in language (I even took an etymology class in high school) so I was hyper aware of regional slang and non-standard dialect and I avoided using any of it in my speech. That wasn't necessarily just me; I remember my social group at school all had this idea that using the local dialect made you sound like white trash. Funny enough, as I get older I find myself slipping into the midwest accent a bit, with creek sometimes coming out as crick, root as rut, etc—even adding an r to my washes (not often, but I have heard myself say it that way occasionally). My accent is probably something of a mess now. Often when I am teaching I will adopt the British RP pronunciation of a word if it makes that word easier for students to hear (for example, for adult ae-dullt instead of ah-dullt because using the ae sound makes it stand out more from any preceding an article), so we get Midwest, RP, standard US, and who knows what else.