I agree that the subject of demonic possession is viewed askance by most people, even by a lot of people who, by their avowed faith, should have no doubts. That does serve to inhibit open discussion by those of us who have had demonic encounters.
I will share this. I attended a Pentecostal Church about 25 years ago, where I was baptized as an adult. During a service one night, a woman struggled in and sat down in a rear pew. After a short time, she suddenly jumped out of the pew and flew up towards the altar, where she seemed to be thrown down (but maybe she fell). She started writhing like a snake, as if there wasn't a joint in her body. The front two pews were emptied immediately, everyone holding her down, and the Pastor didn't even waste time walking around the pulpit. He leaped right over the top of it, and immediately cast the 'thing' out of her. I didn't actually see the demon come out, because people were shoulder-tight all around her. But I saw it come right between two of them, and then it stopped. At that point, apparently, I was the only one in the Church who could see it. I don't know the reason for that. But it came right over to me and pressed itself against me, growling. I felt a coldness that was beyond frigid, from this thing, and the stench was enough to make me reel. It felt as though my sinus' had sulfuric acid and much worse in them. But most hair-raising of all was the horrific filth that I felt, a rot so rotten it was supernaturally filthy, and humans have yet to invent words to adequately describe it, because I have never been able to do so. It made some threats that were empty (the Scripture, "Greater is He who is in you, than he who is in the World", applied). Then, it went right out through the South wall. Had anyone, up to that time, asked me to describe a demon, I would have said something like a red monster with horns, exhaling smoke, and the like. But this thing was built like a 'stick-man', with a head like a sausage and two beady black eyes about a quarter-inch apart. It seemed to be in the process of disintegrating even as it stood there, losing pieces of itself.
I have met people who have what I can only describe as an 'aura' reminiscent of the caste that surrounded that demon. It is not a sensory assault, but a spiritual one - as his was, really.