An interesting episode indeed. My take is this; I don't buy into remote viewing. I don't buy into ley lines even though I'm told one runs straight through the center of my state and the city I live in. Being more on the ghost hunter side of things, I've looked into ley lines a little bit but find no true validity to them. I was told (by someone who was able to maintain a straight face) that because of the ley line that splits our state, we are a hub for paranormal activity and UFO sightings. I was told by this same individual that we've been the focus and center of alien and spirit activity for hundreds of years, right where I live. In my own investigations I can say that this is complete and utter bull crap. Back to the episode...I also don't believe in the ability to "sense" entities, especially when no one else in the area does, either.
Now, despite my disbelief in remote viewing and ley lines, I do think that Mr. Bosley had some experiences he holds to be truly paranormal. That's not to say they were. For instance, the life-altering event when he was 16 where he felt almost possessed or at least that his body was shared. Heck, that type of feeling could be caused by a hormone imbalance say, within a teenager going through quite a few changes, developmentally. His believe in these topics and in what he thinks may have occurred to him do not make me question the fact that he was also in the FBI, however nor does being in the FBI make his stories and experiences any more credible in my opinion. Here's why: take a psychological test and (if you're indeed a Christian) answer "Yes" to the question "Do you believe in Jesus." This Yes answer strikes you into the domain of psychotic in that you have lost touch with reality, however how many Christians are employed and in active duty within the FBI? Of Walter's level or higher? If being a Christian wouldn't exclude you from active, top secret (or above) clearance within the FBI, why would the belief in remote viewing or psychic ability exclude you? The grand majority of what Walter said within the "far out" realm can easily be chalked up as religious or theological paradigm, and though I don't believe it at all, that's not to say there's nothing wrong with Walter, or anybody else believing it.
In the end, I think Walter would be an interesting character to sit down and have a drink with. I'm with Mr. Bishop: I wouldn't believe most of what he talked about, but it would still be a great experience.