I've been in most of those groups over the years. At the moment I wear them almost all day. I do take them out sometimes when I am having an overwhelming day, or those days where louder nonsense is no better than quiet nonsense. The previous ones I used to wear only for certain situations like if I was going to a lecture or something like that. Before that I wore them only when the TOD was coming! Or when I was with the teacher that used to check I had them in at the start of class.
My mum is one of the "never" people. The downside of the free loan hearing aids from the British health service is that they are often (though not always, depends where you live) poor hearing aids and almost always with poor aftercare. My mum is one of the ones told "your hearing aids are right, you will have to get used to them, come back in 3 years" and it didn't matter that her earmoulds hurt her all the time, or that they set up no programs for her as she's over 70 thus would be "unable to manage" just because of her age and never mind her expertise. People can go to the private sector for better hearing aids, but are often scared to go because if this is how terrible hearing aids are who needs to pay for one, right? They haven't realised they have just experienced a poor fitting.
I think both of us would have been able to adjust much better if we'd have been fitted binaurally straight after the hearing loss became apparent, but I missed 6 years, my mum missed about 40 years and then was fitted with one hearing aid simply because she was over 55. She's since been fitted binaurally, but cannot get the ear that didn't wear a hearing aid before to catch up. If we were both kids today and were fitted quickly with modern digital technology I think we'd be better off. I kept on going back and back to the clinic till I got something that convinced me hearing aids could be comfortable and worth wearing, my mum has given up now, which is a shame.
PS. Wonder if there would be more "never" answers if this were in a Deaf culture section not the HA/CI section as most who come in this area of the board are the wearers.